How to Store Kayaks and Canoes Outside in Summer

A fitted, breathable cover with a full-perimeter closure protects stored kayaks and canoes better than a tarp, a storage bag or bare storage. A high-quality kayak or canoe cover utilizes water-shedding, breathable marine fabric that allows trapped moisture to escape while blocking destructive UV rays and sealing out pests.

Standard plastic tarps, even those that claim to be waterproof, can trap condensation, which accelerates mildew. They also leave the underside open to mice, spiders, and pine needles. Specific features to look for are zippered closures and solution-dyed UV fabrics.

Key Takeaways

• A UV-resistant canoe cover is the one step that addresses sun, pests and water at once.
• Fiberglass and Kevlar hulls fade and chalk under UV; polyethylene hulls lose flexibility and can crack. Neither recovers.
• An uncovered hull stored right-side up collects stagnant water, which is breeding habitat for the mosquitoes that carry West Nile virus in Canada.
• A zipper or drawstring closure matters as much as the fabric: an open-bottom canoe tarp still admits mice, spiders and pine needles.
• Breathable, solution-dyed marine polyester resists fading and traps less moisture than a plastic tarp or a sealed canoe storage bag.

Table of Contents

• How UV Radiation Damages Kayaks and Canoes
  • Fiberglass and Kevlar: Fading, Chalking and Resin Breakdown
  • Polyethylene: Embrittlement and Cracking
• What Moves Into an Uncovered Hull
  • Mice, Wasps and Spiders
  • West Nile Virus
  • Stagnant Water
  • Pine Needles, Sap and Bird Droppings
• The Three-Layer Exposure Audit for an Outdoor Canoe Cover
• Choosing a Canoe Cover for Outdoor Storage
  • Fabric: What UV-Resistant Actually Means
  • Closure: Zipper vs. Drawstring vs. Open Tarp
• How Should a Canoe or Kayak Sit on an Outdoor Rack?
• Covers Built for Canadian Weather
• Frequently Asked Questions

How UV Radiation Damages Kayaks and Canoes

Ultraviolet radiation degrades every common hull material, but it does so in different ways. Composite hulls like fiberglass, Kevlar, or carbon, lose their gelcoat and resin surface first; rotomoulded polyethylene hulls lose the chemical stabilizers that keep the plastic flexible. In both cases the damage is cumulative and irreversible, which is why outdoor canoe storage without a cover is a slow, predictable loss.

Canada’s summer sun is strong enough to matter. Environment and Climate Change Canada’s says the index can reach 3 or higher, the level at which protection is advised, between 11 a.m. and 3 p.m. from April through September, and that the highest readings in the country occur in southern Ontario. A hull on a lakeside rack receives direct sun plus UV reflected off the water for the full season

Fiberglass and Kevlar: Fading, Chalking and Resin Breakdown

UV breaks down the gelcoat and polyester or vinylester resin that bind a composite hull, producing fading, a chalky surface and eventually exposed fibre. Pigmented gelcoat is the hull's sacrificial UV barrier; once it thins, the resin beneath yellows and micro-cracks. Kevlar fibre is itself UV-sensitive and darkens or "fuzzes" where resin has worn away, which is why Kevlar hulls are often sold with a UV-protective clear coat and an instruction to keep them out of direct sun when stored.

Polyethylene: Embrittlement and Cracking

Rotomoulded polyethylene does not rot or delaminate, but UV causes photo-oxidation that breaks polymer chains, fades colour and makes the hull brittle. Manufacturers add UV stabilizers to the resin, and those additives are consumed over successive seasons of exposure. The first visible sign is fading; the next is a hull that oil-cans more easily, then stress cracks near seats, scupper holes and the keel line.

Hull material	Primary UV failure	Early warning sign	Reversible?
Fiberglass (gelcoat)	Gelcoat chalking, resin yellowing	Dull, powdery surface that rubs off on a cloth	Partly (compounding and re-coating restore surface, not lost thickness)
Kevlar / aramid composite	Resin breakdown exposing UV-sensitive fibre	Yellowing, fibre fuzz at wear points	Partly (clear coat can be reapplied)
Polyethylene (rotomoulded)	Photo-oxidation, stabilizer depletion	Colour fade, loss of flexibility	No
Royalex / thermoformed ABS	Outer layer chalking, cold cracking	Fading, surface crazing	No

 

A UV protectant spray slows surface damage on all four materials, but it must be reapplied and does nothing for the interior of the hull or for the pests and water discussed below. A cover addresses all of them at once.

What Moves Into an Uncovered Hull

An open hull on a rack is sheltered, dry on top, shaded underneath and undisturbed for weeks. Those are exactly the conditions spiders, wasps and mice look for, and a right-side-up hull adds standing water. The result is a boat that needs cleaning, repair or a trip to the clinic before it goes back on the lake.

Mice, Wasps, & Spiders

Spiders and paper wasps nest under seats, thwarts and deck rigging within days of a boat being left alone. Mice are the more expensive problem: they chew foam flotation, seat straps, bungee cord and hatch gaskets, and their droppings and urine soak into foam and fabric. Deer mice in Canada can carry hantavirus, so a nest found in a stored canoe should be cleared with gloves and a disinfectant rather than swept dry. A cover only helps if it is closed; mice travel along rack cross-bars and enter through any opening at the hull's ends.

West Nile Virus

A canoe or sit-on-top kayak stored right-side up holds rainwater for days, and a kayak cockpit holds it for weeks. According to the , the virus was first detected in Canada in 2001, is transmitted mainly by Culex mosquitoes, and living near stagnant water is a recognized environmental risk factor. Most infections occur in summer and early fall, which is the storage season. A hull of warm standing water beside the dock is a mosquito nursery a few metres from where the family sits.

Stagnant Water

Stagnant water also stains gelcoat, lifts seat varnish and leaves mineral rings on polyethylene. Storing the boat upside down solves the water problem but exposes the hull bottom to full sun and leaves the interior open from below, which is why a cover is the better answer to both.

Pine Needles, Sap and Bird Droppings

Pine and spruce needles are acidic, hold moisture against the hull and are slow to remove once wedged into seams and under seats. Sap bonds to gelcoat and polyethylene and typically needs a solvent to lift. Bird droppings are mildly acidic and etch gelcoat if left through a hot week. None of these damage a hull as fast as UV does, but together they turn every launch into a cleaning job, and the moisture they hold accelerates mildew in foam and webbing.

The Three-Layer Exposure Audit for an Outdoor Canoe Cover

Most canoe storage advice treats "outside" as one condition. It is not; a hull on a lakeside rack faces three separate exposure layers, and a storage method that handles only one of them leaves the other two open. This guide scores each storage method against the three layers, and it explains why the common fixes of a blue tarp, flipping the boat, or a sealed bag often under-perform.

1. Radiation layer: direct and water-reflected UV, plus heat. Solved by opaque, UV-stable fabric over the entire hull.
2. Intrusion layer: mice, spiders, wasps, needles and leaves entering at the bow, stern and rack contact points. Solved by a closure that seals the hull's perimeter, not just its top.
3. Moisture layer: rain entering an open hull, and condensation trapped under a non-breathable cover. Solved by a water-shedding fabric that still breathes.

Scored against those three layers, the usual kayak storage ideas for outside rank as follows:

Storage method	Radiation (UV)	Intrusion (pests, needles)	Moisture (rain, condensation)	Typical failure
Bare hull, right-side up	Aucun	Aucun	None (collects water)	Fade plus stagnant water
Bare hull, upside down	Hull bottom exposed	Open from below	Sheds rain; interior open	Bottom fades; mice enter from underneath
Canoe tarp (poly, tied on)	Good while in place	Poor (open ends)	Poor (traps condensation; tears and lifts in wind)	Mildew, chafe where tarp flaps
Canoe storage bag (sealed)	Good	Good	Poor unless vented (sweats in heat)	Mildew on foam and seats
Fitted canoe cover, breathable fabric, zipper or drawstring	Good	Good	Good	Fit must match hull length and girth

A hull that gets damp from paddling, then is sealed in a non-breathable bag in July heat, will sweat; a breathable, water-shedding cover dries the boat. Breathability is a feature, not a shortcoming.

Choosing a Canoe Cover for Outdoor Storage

A canoe cover is a fabric shell cut to the hull’s shape that closes around the full perimeter of the boat. The right kayak cover for outdoor storage has three attributes: a solution-dyed, UV-stable fabric; a full-perimeter closure; and a cut that matches the hull's length and girth. The canoe and kayak covers at Outdoor Covers Canada are built around all three, which is the basis for the recommendations below.

Fabric: What "UV-Resistant" Actually Means

“UV-resistant” on a label says little on its own. The fabric that holds up longest is solution-dyed, meaning the pigment is mixed into the polymer before the fibre is extruded rather than applied to the surface afterward. Surface-dyed and printed fabrics fade from the outside in; solution-dyed fibre carries colour and UV stabilizer through its full cross-section.

Venture Sport Covers, the line Outdoor Covers Canada carries for canoes and kayaks, use ShurTex 300D solution-dyed marine-grade polyester with a polyurethane inner treatment that sheds rain while allowing moisture to escape. The fabric is not fully waterproof by design; the breathability is what prevents the sweating problem described in the audit above.

Closure: Zipper vs. Drawstring vs. Open Tarp

A zipper gives the most complete seal and the easiest on-off; a drawstring hem gives an adjustable perimeter seal; an open tarp gives neither. The Venture covers use a half-hull-length zipper so the cover can be pulled over the bow and stern and closed along the side, leaving no open end for mice to enter. For cottagers who launch several times a week, the zipper matters as much as the fabric: a cover that takes five minutes to tie down is the cover that gets left off.

How Should a Canoe or Kayak Sit on an Outdoor Rack?

Upside down or on its side, on a rack that keeps it off the ground, under a cover sized to its length and widest girth. Measure hull length and the widest girth before ordering; a cover sized for a 16-foot canoe will not seal on an 18-foot model. Venture covers come in ten sizes, from slim kayaks under 12 feet to tandem kayaks up to 19'6" and canoes up to 18 feet. The same sizing logic applies to Outdoor Covers Canada's pedal boat cover for cottages with more than one craft on the dock.

A practical routine for the paddling season:

• Rinse and let the hull dry before covering after each outing; do not cover a boat that is still wet.
• Store on the rack upside down or on its side so the cockpit cannot pool water if the cover is ever left off.
• Place the rack out from under pine and spruce where possible; sap and needles shorten the life of the cover as well as the hull.
• Open the cover monthly to check for nests and wipe down the interior.
• Clean the cover itself per the manufacturer's product care instructions at season's end, then move to a winter storage plan. Outdoor Covers Canada's winter boat storage guide covers the freeze-thaw issues that summer storage does not.

Why Choose Outdoor Covers Canada

• Covers for kayaks and canoes made with ShurTex™ 300D marine grade fabric
• Built specifically for Canadian weather conditions.
• Breathable, weather-resistant solution-dyed polyester prevents trapped moisture.
• 9 Google rating based on 212 reviews
• Kayak cover sizes from 11’6” to 19’6”
• Canoe cover sizes from 15’ to 18’
• 1 year product warranty (unless otherwise stated)

Covers Built for Canadian Weather

Outdoor Covers Canada supplies marine-grade covers for canoes, kayaks, boats and personal watercraft to customers across the country from its base in Mississauga, Ontario, and its product range is selected for Canadian conditions: high summer UV, heavy pollen and needle fall, and the freeze-thaw cycles that follow.

The three-layer audit in this guide reflects the questions its team asks before recommending a cover, and the Venture line is stocked in ten sizes because fit is the variable most often wrong in a returned cover.

A hull left bare on a rack loses value every season; a fitted, UV-resistant canoe cover with a closed zipper prevents most of that loss for a fraction of the hull's replacement cost. To match a cover to a specific canoe or kayak, review the canoe and kayak product line or contact Outdoor Covers Canada with the hull's length and widest girth.