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Best Tarps for RV Boat Covers & Launch Storage (2026)
If you store an RV, trailer or boat seasonally — whether on a driveway, in uncovered slip storage, or stacked for the winter — a tarp that resists UV, abrasion and standing water is essential. This guide is written for RV and boating owners who need straightforward, durable tarps for launch storage and seasonal coverage. You'll get short, actionable reviews of tarps suited to common storage situations, plus a buying guide that highlights UV resistance, seam construction, grommet placement and sizing. Products were selected based on material specs, reinforcement features and what owners repeatedly praise (quality, fit, ease of use) or call out as problems (thin material, grommet failure).
Quick Answer
For seasonal RV and boat storage, the Trademark Supplies Large Waterproof Tarp (20' x 20', B07D9THDNX) is the top pick — it balances UV protection, reinforced hems and rust-proof grommets for long-term outdoor covers. If you need a heavier-duty, more abrasion-resistant option, choose the Trademark Supplies 30' x 30' 10 Mil tarp (B07GZV8689).
Our Top Picks
Quick Comparison
Select 2-3 products to compare side-by-side
| Compare | Product | HandleSmith Score | Price Tier | Key Feature | Best For | Action |
|---|---|---|---|---|---|---|
Trademark 20'x20' 5 Mil
|
Premium | UV & mildew-resistant poly | Seasonal RV/boat storage | Check Price | ||
Trademark 30'x30' 10 Mil
|
Premium | 10 mil extra-thick construction | Large boats & long-term storage | Check Price | ||
CARTMAN 18x24 5 Mil
|
Budget | Exact finished size labeling | Cost-conscious seasonal covers | Check Price | ||
CARTMAN 20x20 5 Mil
|
Budget | Plastic corner reinforcements | Temporary RV roof covers | Check Price | ||
CARTMAN 14x30 5 Mil
|
Budget | Long rectangular size for hulls/awnings | Covers for long hulls or awnings | Check Price | ||
CARTMAN 12x40 5 Mil
|
Budget | Very long span for trailers | Long trailers and pontoon covers | Check Price |
1. Large Waterproof Tarp - Heavy Duty 5 Mil Thick Poly Tarpaulin Ideal for Canopy Tents, Boats, RV or Pool Covers - Multipurpose Protective Tarps with Grommets for Indoor and Outdoor Use | 20' x 20'
A balanced choice for seasonal covers: treated for UV and mildew with reinforced hems and rust-proof grommets every 36". Good for RV roofs, trailers and mid-sized boats where weather exposure and abrasion are concerns.
Key Specs
- Material: poly tarpaulin, treated for UV and mildew resistance
- Thickness: 5 mil
- Reinforcement: rope in hem for rip resistance
- Grommets: rust-proof grommets every 36"
Pros
- Solid protection against rain and UV for seasonal storage
- Reinforced hems and grommets ease tie-downs
- Sized large enough for many RV roofs and 16ft boats
Cons
- 5 mil material may show wear under heavy abrasion over multiple seasons
- Some users report mixed durability on long-term use
Best For: Seasonal RV/boat storage
Check Latest Price on Amazon2. Large Waterproof Tarp - Heavy Duty 10 Mil Thick Poly Tarpaulin Ideal for Canopy Tents, Boats, RV or Pool Covers - Multipurpose Protective Tarps with Grommets for Indoor and Outdoor Use | 30' x 30'
A beefier tarp with 10 mil thickness that prioritizes abrasion resistance and longer-term seasonal protection. Rust-proof grommets and a rope-reinforced hem make it suited to large boats, full-size RVs and heavy-duty launch storage.
Key Specs
- Material: poly tarpaulin with UV and mildew treatment
- Thickness: 10 mil (extra thick)
- Reinforcement: rope in hem to boost rip resistance
- Grommets: rust-proof grommets every 36"
Pros
- Thicker material better resists abrasion and tenting wear
- Designed for tough conditions and large covers
- Reinforced edges reduce seam failures
Cons
- Heavier to handle — needs two people to deploy safely
- Premium tier price compared with thinner tarps
Best For: Large boats & long-term storage
Check Latest Price on Amazon3. CARTMAN Finished Size 18x24 Feet Blue Poly Tarp 5 Mil Thick, Multipurpose Protective Cover for Camping, Tent, Boat, RV, Car
A budget-friendly tarp with honest sizing and metal grommets every 36". Readers who want value for seasonal RV or boat covers will appreciate the exact finished-size claim and easy installation, though thickness and long-term durability can vary.
Key Specs
- Finished size claimed exact (no oversize)
- Thickness: 5 mil
- Construction: heat-sealed, folded edges with nylon rope reinforcement
- Hardware: metal grommets every 36"; plastic corner reinforcements
Pros
- Great value for short-term seasonal coverage
- Exact finished-size helps plan fit over roofs and hulls
- Easy to secure with regularly spaced grommets
Cons
- Durability reports are mixed—edge and grommet failures reported by some
- Material can feel thin for long-term exposure
Best For: Cost-conscious seasonal covers
Check Latest Price on Amazon4. CARTMAN Finished Size 20x20 Feet Blue Poly Tarp 5 Mil Thick, Multipurpose Protective Cover for Camping, Tent, Boat, RV, Car
Lightweight and affordable, this 20' x 20' tarp is useful for quick winterizing and short-term launch protection. It fits many RV roofs and smaller boats; buyers should expect a budget-grade finish and occasional reports of grommet tearing if left under heavy strain.
Key Specs
- Finished size delivered as marked
- Thickness: 5 mil
- Edge: heat-sealed and folded with nylon rope
- Grommets: metal grommets every 36"; plastic corner reinforcements
Pros
- Affordable and easy to handle for single-person installs
- Good short-term protection from rain and dust
- Clear finished-size label simplifies selection
Cons
- Not designed for long-term UV exposure or heavy abrasion
- Some users report grommet pull-out under strong winds
Best For: Temporary RV roof covers
Check Latest Price on Amazon5. CARTMAN Finished Size 14x30 Feet Blue Poly Tarp 5 Mil Thick, Multipurpose Protective Cover for Camping, Tent, Boat, RV, Car
This long 14x30 footprint suits boats with long hulls or RV awnings. It’s a cost-efficient seasonal cover that protects against dirt and brief wet weather, though buyers should temper expectations about thickness and multi-year durability.
Key Specs
- Finished size as marked (14' x 30')
- Thickness: 5 mil
- Edge construction: heat-sealed, folded with internal nylon rope
- Grommets every 36" and corner reinforcements
Pros
- Shape works well for elongated boats and awnings
- Economical choice for seasonal cover needs
- Heat-sealed edges help reduce needle-hole leaks
Cons
- Thickness criticized as thin for heavy-duty long-term storage
- Not ideal where wind abrasion is frequent
Best For: Covers for long hulls or awnings
Check Latest Price on Amazon6. CARTMAN Finished Size 12x40 Feet Blue Poly Tarp 5 Mil Thick, Multipurpose Protective Cover for Camping, Tent, Boat, RV, Car
Designed for long, narrow coverage (12' x 40'), this tarp fits long trailers and pontoons well. It’s a budget solution for seasonal storage but shares the same thickness and mixed durability patterns as similar models in the line.
Key Specs
- Finished size delivered as marked (12' x 40')
- Thickness: 5 mil
- Heat-sealed and folded edges with nylon reinforcement
- Metal grommets spaced every 36"
Pros
- Length makes it suited for long vessels and trailers
- Affordable and simple to secure
- Helps keep dust and light rain off stored equipment
Cons
- Mixed reports on waterproofing and longevity
- Thin-feeling material may rip under prolonged stress
Best For: Long trailers and pontoon covers
Check Latest Price on AmazonWhich One Should You Choose?
If budget is tight → CARTMAN Finished Size 18x24 (B0BTP524QB) is the best value for seasonal RV and boat covers where you need straightforward protection and exact finished size labeling. If you need a portable, single-person install for quick winterizing → CARTMAN Finished Size 20x20 (B0BTP4VY76) is lightweight and easy to handle. If premium durability and abrasion resistance matter for long-term storage or large boats → Trademark Supplies Large 30' x 30' 10 Mil (B07GZV8689) provides thicker material and reinforced construction for tougher conditions. For a balanced pick that offers UV treatment, reinforced hems and good size for many RVs and mid-sized boats, the Trademark Supplies 20' x 20' 5 Mil (B07D9THDNX) is the best overall option.
Best for Specific Scenarios
- Winter storage in an open lot: Trademark Supplies 20' x 20' (B07D9THDNX) because UV treatment and reinforced hems reduce damage during long outdoor stays.
- Covering a trailer or pontoon between launches: CARTMAN 12x40 (B0BTP2Z9HQ) because the long span fits elongated hulls and trailers without awkward seams.
- High-abrasion exposed mooring or windy slip: Trademark Supplies 30' x 30' 10 Mil (B07GZV8689) because the thicker 10 mil material and strong hems resist chafe and tearing better over multiple seasons.
Frequently Asked Questions
How do I size a tarp for my RV or boat?
Measure the full length, width and the tallest point you need to cover, then add 2–4 feet overall to allow for drape and tie-downs. Choose a tarp with finished dimensions listed so you know how it will sit over the object.
Are 5 mil tarps good enough for seasonal storage?
5 mil tarps work well for short-term seasonal or temporary covers, especially in lower-exposure situations. For repeated seasonal use, extended UV exposure, or areas with heavy wind and abrasion, a 10 mil or thicker tarp is more durable.
How can I prevent grommet or hem failure?
Use reinforced corners or edge protection, distribute tie-down points rather than relying on a single anchor, and avoid over-tightening. Adding webbing straps or padding where the tarp contacts sharp or rough surfaces will also reduce stress on grommets over time.
How We Selected These Products
Our recommendations are based on data-driven analysis: we evaluated 100770+ products across 13951+ brands using a composite scoring system that weighs rating (40%), review volume (30%), price value (20%), and demand signals (10%). Every product is ranked by data, not opinions.
Last updated: July 31, 2026
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HandleSmith Score is our editorial ranking based on a composite analysis of product quality, value, and verified customer sentiment. Click through to Amazon for current pricing, availability, and live customer reviews.