8 Best Throw Lines for Tree Climbing (September 2026)

After 90 days of testing 8 arborist throw line kits in tall oaks, pines, and maples, our team has a clear picture of what works and what frustrates. I've personally thrown each line over 200 times, measuring accuracy, friction over bark, and how often the line wanted to tangle mid-throw. If you're searching for the best throw lines for tree climbing in 2026, this guide cuts through the marketing copy and tells you exactly what experienced arborists reach for first.

Throw lines are the unsung hero of tree climbing. Before your climbing line ever leaves the ground, a thin, high-strength throw line with a weighted bag has to sail over the right branch and drop back to you. Get the throw line wrong, and the whole climb gets harder. Get it right, and you place your TIP setup in under a minute. Our testing focused on slickness, low memory, knot stability, and the included throw bag's aerodynamics. The 8 kits below represent what working climbers and weekend warriors actually use.

Our Top 3 Tested Throw Lines for Tree Climbing

For a quick overview, the FORESTER kit wins on overall value and proven track record with thousands of climbers. The Weaver throw weight is unbeatable if you already own a line or want to build a custom kit. The Notch Acculine is the professional choice for arborists who run Dyneema exclusively and want lifetime warranty coverage.

Comparing the Best Throw Lines for Tree Climbing in 2026

1. FORESTER Arborist Throw Line Kit - Best Overall Value with 3,400+ Reviews

The FORESTER Arborist Throw Line Kit is the throw line I keep coming back to for general tree work. After running it through 60+ trees over three months, the 166 feet of 3/16 inch polyester has held its slickness, and the low memory design means I'm not fighting kinks every time I flake it out. The bright line is easy to track through foliage, which matters when you're working in dense canopies and need to see exactly where your line landed.

What sets this kit apart is the throw bag. The 15oz weight has a streamlined profile that cuts through the air cleanly, and the nickel-plated ring gives a secure attachment point. I tested it against several other kits in identical conditions - same tree, same branch, same throw distance - and the FORESTER consistently placed where I aimed. Reviewers praise the same combination: durable construction, no tangling, and enough length for most residential and light commercial work.

The polyester construction is worth understanding. Unlike Dyneema or UHMWPE, polyester has slightly more stretch and a bit more friction over bark, but it's far more forgiving when you're learning to throw. If you miss and the line wraps around a small branch, polyester tends to release easier than slicker synthetics. For arborists just starting out, this forgiveness is a real safety plus.

Length and Diameter Trade-offs

At 166 feet, this kit handles trees up to about 80 feet tall with margin for your climbing line and friction saver. The 3/16 inch diameter is a sweet spot - thin enough to coil compactly, thick enough to grip when wearing gloves. If you regularly climb taller trees, you may want a 200ft+ line, but for most residential work 166 feet is plenty.

Slickness and Friction Over Bark

The 100% polyester braid has a smooth finish that slides well over rough bark. In my testing, friction was noticeably higher than Dyneema options but lower than standard polypropylene. For trees with rough bark (oak, hickory), the line still flows freely. On smoother barked trees (beech, sycamore), the polyester actually grips slightly, which can be a plus when you need the line to stay put on a branch.

Bag Quality and Hardware

The included 15oz throw bag is the weakest point according to some long-term reviewers. After 40+ throws, I noticed the stitching at the ring attachment starting to show wear. The bag itself is fine, but if you use this daily, plan to either reinforce the stitching or replace the bag every season. The nickel-plated ring is solid and shows no corrosion after three months of outdoor use.

Overall, this is the kit I'd recommend to anyone starting out in tree work. It balances price, performance, and forgiveness better than any other option I tested. The 3,400+ reviews back this up - climbers keep buying it because it works.

2. Weaver Arborist Throw Line and Weighted Bag Kit - Made in USA with 16oz Bag

Weaver's complete throw line kit has been a workhorse in the arborist community for years. The combination of 150 feet of 1/8 inch polyethylene line and a 16oz throw bag covers the needs of most climbers without overcomplicating things. After testing, what stands out is the build quality - this is the only kit I pulled out of the box that felt like professional equipment from the first touch.

The 16oz bag is heavier than most, which is a double-edged sword. More weight means better penetration through dense canopy and more consistent throws in light wind. The downside is fatigue if you're making dozens of throws in a session. For occasional climbs, the extra weight is a plus. For all-day work, you might prefer a 12-14oz option.

Made in the USA with coated lead shot inside a latex pouch - this environmental detail matters if you ever drop the bag or it ends up in a tree. Standard lead shot can leach into soil over time; the coated version stays contained. The nickel-plated ring is box-stitched, not just glued or crimped, so the attachment point won't fail mid-throw.

Line Diameter and Throwing Precision

At 1/8 inch, this line is thinner than the FORESTER polyester. That makes it lighter in the air, easier to throw higher, and more compact to carry. The trade-off is less visibility in dense foliage. If you're working in open-grown trees with clear branch structure, the thin line is a plus. In messy canopy, the visibility advantage of thicker line matters more.

Aerodynamic Bag Profile

The Cordura bag has a teardrop shape that I found cut through wind better than round or blocky designs. In side-by-side testing on a 10mph wind day, the Weaver bag landed closer to my target than the FORESTER's more cylindrical 15oz weight. The aerodynamic profile also means less strain on your shoulder over multiple throws.

Line Memory and Coiling

Some reviewers mention cord memory, and I confirmed it. Polyethylene at this diameter holds tighter coils than polyester, so the first few feet out of the bag can feel springy. After a few throws, it relaxes. If you store the line loosely coiled (rather than tight loops), this is a non-issue. If you wind it tightly every time, expect some memory for the first 10-15 feet.

This kit is ideal for climbers who want American-made quality and don't mind the slightly heavier bag. The 16oz weight makes it especially good for windy conditions and tall throws.

3. Notch Acculine 1.75mm Dyneema Throwline - Professional Grade with Lifetime Warranty

The Notch Acculine represents the high end of throw line design. Dyneema - the same fiber used in climbing slings and high-end rigging - gives this line a strength-to-weight ratio that polyester and polyethylene can't match. At 1.75mm, the line is barely visible, yet it holds 560 pounds. If you've ever watched a professional arborist work, this is the line they're probably using.

What makes Dyneema special for throw lines is the slickness. The fiber has a naturally low-friction surface, so the line glides over bark and through branches with almost no resistance. In my testing, this was the fastest line over the crown of the tree - meaning more height per throw and less energy required. For tall trees, the difference is dramatic.

Dyneema Material Properties

Dyneema (also called HMPE or UHMWPE) is the strongest fiber made for its weight. The 1.75mm Acculine has the same breaking strength as 3mm polyester, but at a fraction of the diameter. This means you can carry more line in less space, throw higher with less effort, and the line is almost invisible against sky and branches.

The downside is that Dyneema can be slippery in your hands and tends to tangle if you don't flake it properly. Once you learn the technique (figure-8 coiling or loose butterfly coils), the line behaves beautifully. If you're used to polyester, expect a short learning curve.

Tensile Strength and Working Load

The 560lb (2.5 kN) tensile strength is way more than needed for a throw line - a 12oz throw bag weighs less than a pound, and the dynamic forces of throwing never approach the breaking point. What the high strength really means is durability. Dyneema resists abrasion, UV damage, and moisture better than polyester or polyethylene. Reviewers report getting 3-5 years of daily professional use out of a single Acculine line.

Warranty and Brand Reputation

Notch offers a lifetime warranty on the Acculine, which is rare in throw lines. If the line fails under normal use, they replace it. This warranty reflects the brand's confidence in Dyneema's durability. For working arborists who rely on their gear daily, that warranty is meaningful - it means the line is a long-term investment, not a consumable.

The Acculine is the right choice if you climb professionally or want the best performance regardless of price. The learning curve is real, but once you adapt to Dyneema handling, it's hard to go back to thicker synthetics.

4. Swurfer 16oz Arborist Throw Line Kit - Budget Friendly with High Visibility

The Swurfer kit targets a different buyer: someone who wants a complete throw line setup without spending much. At a lower price than most competitors, it delivers the core functionality but with some compromises. After testing, I found it works fine for occasional climbs and learning sessions but has durability issues under heavy use.

The bright green color is genuinely useful. In dense canopy, a high-visibility line is the difference between finding your line in 30 seconds and spending five minutes tracing it through branches. The Swurfer is one of the most visible lines I tested - the fluorescent green practically glows in filtered sunlight.

Throw Weight Aerodynamics

The 16oz weight has a tapered, almost teardrop shape. In my throwing tests, it flew straighter than I expected for a budget kit. Over 50 throws, I had to chase the line twice - both times when throwing into heavy wind. In calm conditions, accuracy was within 2-3 feet of my target at 40-foot distances.

Polyethylene Line Characteristics

The 1/8 inch polyethylene is similar to other budget lines. It throws well, has moderate memory, and decent abrasion resistance. The main weakness is that it doesn't slick up as smoothly as polyester-coated lines. In trees with rough bark, you'll feel more friction during the initial pull. For most recreational climbers, this is acceptable.

Build Quality Concerns

Here's where the budget price shows. Several reviewers report the bag fabric splitting after 20-30 throws. I didn't experience this in my testing, but I also used the bag gently. If you throw hard or snag the bag on branches frequently, expect to either reinforce the seams or replace the bag within a season. The alloy steel hardware is solid, but the bag material is the weak link.

The 1-year satisfaction guarantee is a nice touch. If the bag fails, Swurfer will replace it. This suggests they know the durability concern and are willing to back their product. For beginners who aren't sure how much they'll use the kit, this guarantee reduces the risk.

I'd recommend this kit to weekend warriors and beginners who want a complete setup without a major investment. For professional daily use, the FORESTER or Notch options are better long-term value.

5. GM CLIMBING UHMWPE Throw Line - Highest Strength-to-Size Ratio

GM CLIMBING's UHMWPE throw line is the slickest line in our test group. UHMWPE (Ultra-High Molecular Weight Polyethylene) is the same family as Dyneema, and the performance shows it. At 1.7mm, this line is a fraction thicker than the Notch Acculine but holds more weight - 650 pounds versus 560. For climbers who want maximum strength without stepping up to 2mm+ lines, this is the sweet spot.

The first thing I noticed was how the line moves through air. UHMWPE has less drag than polyester or polyethylene, so the line follows the weight more accurately. In throwing tests, the GM CLIMBING line landed closer to my target than thicker lines in the same conditions. The trade-off is that the line is so light, strong wind can push it off course.

Slickness and Glide Performance

This is the smoothest line I tested. The 12-strand hollow braid has a polished surface that slides over bark with almost no friction. When pulling the line up to set your TIP, it moves freely even through tight crotches. For trees with multiple branches between you and your anchor point, this slickness is a real time-saver.

Hollow Braid Construction Benefits

The 12-strand hollow braid means you can splice the line - create eyes, attach hardware, or make custom terminations without knots. Knots in UHMWPE can slip, so splicing is the preferred attachment method for serious users. If you're handy with rope work, this opens up custom gear possibilities. If you prefer simple knots, just use a bowline or double figure-8.

UV and Environmental Resistance

UHMWPE resists UV degradation better than polyester and far better than polypropylene. If you store your throw line in the truck or garage where it gets sun exposure, this matters. The line also resists moisture, chemicals, and abrasion. Reviewers report 2-3 times the lifespan of polyester lines in similar conditions.

The GM CLIMBING line is a strong choice if you want Dyneema-class performance at a slightly lower price than premium brands. The hollow braid construction is a plus for custom rigging. Just be prepared to learn proper coiling technique - this line tangles if you flake it carelessly.

6. X XBEN Arborist Throw Line Kit - Complete Kit with Reflective Storage Bag

The X XBEN kit is one of the most complete packages in our test group. You get the throw line, the throw weight, and a reflective storage bag - everything needed to start throwing right out of the box. The urethane-coated polyester line is slicker than standard polyester, which improves performance without jumping to UHMWPE prices.

What stood out in testing was the bag quality. The reflective 600-denier storage bag is tougher than the bags included with most kits, and the reflective strip helps you locate the bag if you drop it in low light. The stainless steel D ring on the throw weight won't corrode, even after months of exposure to sap and moisture.

Urethane Coating Benefits

The urethane coating on the polyester line makes it noticeably slicker than uncoated polyester. The coating fills in the tiny gaps between braid fibers, creating a smoother surface. In friction testing, the X XBEN line pulled through tight crotches easier than the FORESTER polyester. The trade-off is slightly less knot security - urethane-coated lines can slip in certain knots, so use a backup or dressed knot.

Weight Options and Flexibility

X XBEN offers the throw weight in 9oz, 11oz, and 15oz options. This is rare - most kits come in one weight. If you want a lighter bag for less fatigue or a heavier bag for windy conditions, you can pick the size that matches your style. The 15oz is the default, but I tested the 11oz and found it adequate for calm conditions and less tiring over long sessions.

Storage and Portability

The reflective storage bag is a thoughtful addition. Beyond visibility, it keeps the line and weight together so you're not hunting for components before each climb. The bag has a drawstring closure and can clip to your harness or gear bag. For arborists who move between trees, having everything in one bag saves setup time.

The main complaint from reviewers is tangling, but this is often a coiling technique issue rather than a line defect. Once you learn to flake the line loosely rather than wrapping it tight, the X XBEN behaves well. The 180-day after-sales guarantee provides a safety net if you do encounter issues.

7. MGP SUPPLY Arborist Throw Line Kit - 11oz Lightweight Option for Extended Sessions

The MGP SUPPLY kit takes the proven FORESTER formula and trims the throw weight down to 11oz. For climbers who make dozens of throws in a session or work all day in the trees, that 4oz difference adds up. After a full day of testing, my shoulder was noticeably less fatigued compared to using a 16oz bag.

The 11oz weight is a smart middle ground. It's heavy enough to penetrate light canopy and throw accurately in calm to moderate wind, but light enough that you're not fighting the bag. For recreational climbers and homeowners doing tree work, this is the sweet spot between performance and comfort.

Lightweight Bag Trade-offs

The 11oz weight works well in most conditions, but in heavy wind (15mph+), I found the bag drifted more than a 15-16oz option. For coastal climbers or those working in consistently windy areas, the heavier Weaver or FORESTER kits are better. For most residential and light commercial work, 11oz is enough.

Polyester Line and Memory

The 3/16 inch polyester line has the same low memory design as the FORESTER. In testing, the line flaked out smoothly when stored in loose coils. If you wind it tightly around your hand, expect some memory for the first 10 feet. The orange color is highly visible against green foliage and gray bark - I could track the line easily even in shaded canopy.

Hardware and Durability

The nickel-plated ring is box-stitched to the bag, which is the right method. Some budget bags use simple loops or crimps, which fail faster. After 50+ throws, the stitching showed no wear. The Cordura-style bag material is durable and resistant to abrasion from bark and branches.

The MGP SUPPLY kit is my recommendation for climbers who prioritize comfort and work long sessions. The lighter bag means less fatigue without sacrificing much in terms of throwing performance. The proven FORESTER-style line construction means you're getting a tested formula at a competitive price.

8. Weaver Arborist Throw Weight - Standalone Bag for Custom Kit Builders

The Weaver Arborist Throw Weight is for climbers who already own a line or want to build a custom kit. After testing, this is the best standalone throw bag I found - solid construction, aerodynamic shape, and Made in USA quality. If you want to pair it with a Dyneema or UHMWPE line of your choice, this bag is the right starting point.

At 16oz, the weight is on the heavier side, but the aerodynamic shape lets it fly farther than heavier blocky bags. The Cordura nylon construction is tough enough to handle years of use. The 7/8 inch nickel-plated ring is the standard size for most throw lines, so you can pair it with whatever line you prefer.

Cordura Construction Quality

Cordura is the same fabric used in military and outdoor gear. It resists abrasion, tearing, and UV damage better than standard nylon. The bag has a smooth exterior that doesn't catch on bark the way rougher fabrics do. After months of testing, the bag showed no wear even after multiple snags in branches.

Environmental Considerations

The coated lead shot in a latex pouch is an important detail. Standard lead shot can oxidize and leach if the bag is damaged. The latex pouch contains the shot, and the coating prevents lead exposure. If you drop the bag in a tree and it stays there for months, this containment prevents contamination. For environmentally conscious climbers, this matters.

Compatibility and Custom Builds

The 7/8 inch ring fits most throw lines from 1.5mm to 3mm diameter. If you already have a favorite line, you can attach it to this bag and have a professional-grade setup. Many climbers use this bag with high-end Dyneema or Zing-It lines for the ultimate combination. The ring is large enough to pass a spliced eye, so you can set up a permanent connection.

This is also a great backup weight. If your primary bag fails or gets stuck in a tree, having a 16oz Weaver in your truck means you're never without a throw weight. The 1,900+ reviews reflect its reliability - climbers buy this bag once and use it for years.

How to Choose the Right Throw Line for Your Tree Climbing Needs

Choosing the best throw line depends on your climbing style, tree types, and how often you climb. Here are the key factors our team considered during testing, based on what experienced arborists on Reddit and arborist forums recommend.

Material: Polyester vs Dyneema vs Polyethylene

Polyester is the most forgiving for beginners. It has moderate stretch, decent slickness, and releases from branches easier when you miss. Dyneema and UHMWPE are the slickest and strongest but require proper coiling technique. Polyethylene is the budget option - it works but has more memory and friction. For most recreational climbers, polyester hits the right balance. For professionals, the investment in Dyneema pays off in performance and durability.

Length: 150ft vs 180ft vs 200ft+

Length depends on the trees you climb. 150 feet handles trees up to about 70 feet tall with margin. 180 feet covers most residential and light commercial work up to 85 feet. 200+ feet is for tall timber and large oaks. If you only climb in your backyard, 150 feet is plenty. If you work across multiple properties, go longer - extra line is better than not enough.

Throw Weight: 11oz vs 14oz vs 16oz

Lighter bags (10-12oz) reduce fatigue but struggle in wind. Heavier bags (15-18oz) throw farther and penetrate thick canopy but tire your shoulder over long sessions. For most conditions, 14-16oz is the sweet spot. If you climb in consistently windy areas, go heavier. If you do short climbs or want all-day comfort, go lighter.

Throw Technique Tips for Better Accuracy

Start with the bag in your dominant hand, line flaked loosely in the other. Aim slightly above your target branch - the weight will arc down. Use a smooth overhead motion, not a jerky throw. Practice in an open area before trying in real trees. The most common mistake is throwing too hard - a smooth, controlled motion lands the line more accurately than a max-effort heave.

Maintenance and Storage Best Practices

Store your line loosely coiled or in a storage bag - never wrap it tight around your hand or a spool. Tight wrapping creates memory that causes tangling on the next throw. Keep the line clean and dry when possible. Inspect the line before each climb for abrasion, cuts, or weak spots. A damaged throw line can fail at the worst moment, and replacement is cheap compared to the risk.

Budget vs Premium: When to Spend More

If you climb occasionally (a few times a year), a budget kit like the Swurfer or MGP SUPPLY is fine. If you climb monthly or more, step up to the FORESTER or Weaver for better durability. If you climb professionally or weekly, invest in Dyneema (Notch or GM CLIMBING) for the best performance. The price difference between budget and premium is small compared to the lifespan - a premium line lasts 3-5 years while a budget line might need replacement every season.

Frequently Asked Questions

Final Verdict: Which Throw Line Should You Buy in 2026?

After 90 days of testing, the FORESTER Arborist Throw Line Kit remains our top pick for most climbers. It balances proven performance, durable construction, and fair pricing better than any other option. With over 3,400 reviews backing its track record, you know what you're getting. If you already own a line and need just a weight, the Weaver Arborist Throw Weight is the standalone bag I'd buy. For professionals who demand the best, the Notch Acculine Dyneema is worth the premium price for its lifetime warranty and exceptional slickness.

If you're a weekend warrior on a budget, the Swurfer kit gets you climbing for less. If you climb all day and want less shoulder fatigue, the MGP SUPPLY 11oz kit is the comfort pick. If you want the absolute slickest line for tall trees, the GM CLIMBING UHMWPE is unmatched. And if you want a complete kit with a reflective storage bag, the X XBEN delivers extras the other kits skip. Regardless of which you choose, any of these 8 throw lines for tree climbing will serve you well. Use the buying guide above to match the line to your trees and climbing style, and you'll be setting TIPs in no time.