Jon Boat Cover 14: How to Measure, Choose and Fit One (2026)

Updated November 2026

A jon boat cover 14 keeps rain, leaves, snow and UV damage off a 14-foot aluminum or fiberglass jon boat when it sits on a trailer, a dock or in the yard. The right cover fits snugly, sheds water, and still lets moisture escape so the hull and interior don’t trap mildew. This guide walks you through measuring, choosing material and fitting the cover so it stays put.

Step 1: Measure Your 14-Foot Jon Boat Correctly

Most covers are sized by length and beam, so start with accurate numbers. Measure the overall length from the bow tip to the transom, not just the hull bottom. Then measure the beam at the widest point, usually the top of the gunwales. Add a few inches to each dimension if you plan to cover a motor, a bow-mounted trolling motor or a rod rack that sticks out.

Shopping for one? See our guide: 3 Best 14ft Jon Boat Covers for Every Need (2026).

Also measure the height from the deck to the highest point you want covered, such as a console or a T-top. Covers that look right on paper can sag or pull on a low-profile boat, so compare your measurements to the sizing chart on the manufacturer’s page before ordering.

Step 2: Choose the Right Material and Fit Style

Jon boat covers usually come in three fit styles. A form-fitted cover is cut to the hull shape and gives the cleanest look but costs the most in precision. A tie-down or semi-custom cover uses straps and cinch points and handles a range of boat shapes. A universal cover is the budget pick, but it needs more tension work to stay tight.

Material matters as much as fit. Look for solution-dyed polyester or marine-grade vinyl with UV inhibitors, and check whether the fabric is listed as waterproof rather than water-resistant. Breathable fabrics reduce condensation, which is the main cause of trapped moisture and mildew under a cover.

Step 3: Fit the Cover So Water Drains and Wind Can’t Lift It

1. Lay the cover on the boat with the front seam at the bow and the rear at the transom.
2. Center it side to side, then pull the front and rear edges down evenly.
3. Run the bungee or cable cinches under the hull at the marked points and tighten until the fabric is taut but not stretched.
4. Check that the cover slopes toward the sides so rain runs off instead of pooling on the deck.
5. Secure any tie-down straps to the trailer frame or a dock cleat, not to a rail that can flex.

A cover that sags will collect water and can tear at the seams when wind gets under it. Re-tighten after the first few storms, because fabric settles.

Step 4: Add Ventilation and Keep the Boat Dry

Even a good cover traps some humidity. Vents placed on the leeward side, typically one or two per side, let warm, moist air escape. Pair vents with a few moisture absorbers inside the hull and remove wet items like life jackets and cushions before covering. Check the boat monthly during long storage.

Common Mistakes to Avoid

• Buying by length alone and ignoring beam, which leaves the sides exposed.
• Covering a wet boat, which traps moisture against the gunwales and deck.
• Skipping straps or cinches in windy areas, letting the cover billow and chafe.
• Storing the cover wet in a bag, which encourages mildew on the fabric.
• Leaving the cover tight over a tongue jack or rail that can rub through the material.

Recommended Gear

• Cover straps with cam buckles: These let you tension the cover evenly and adjust it after storms. View on Amazon
• Dehumidifier pouches for boats: Moisture absorbers reduce the mildew risk inside the hull under a cover. View on Amazon
• Cover vent kit: Adds airflow to help condensation escape without letting rain in. View on Amazon

FAQ

How do I know if my jon boat cover 14 will fit?

Compare your measured length and beam, plus any motor or rod-rack overhang, to the manufacturer’s sizing chart. If you’re between sizes, choose the larger one and use extra straps to tighten it.

Is a waterproof cover enough to prevent mildew?

Not on its own. A waterproof cover that doesn’t breathe can trap condensation, so look for vents and keep the boat dry before covering.

Should I remove the cover in winter?

If snow piles up, brush it off promptly, since the weight can stretch the fabric and collapse the cover. Consult the cover maker’s care instructions for snow load limits.

Conclusion

A well-fitted jon boat cover 14 starts with accurate measurements and a material that sheds water while breathing. Tighten it with straps, add vents and keep moisture out of the hull. Check the cover after storms and your 14-foot boat will stay protected through every season.

Related reading

• Top 3 Covers for 14 Ft Jon Boat Picks Compared in 2026
• Jon Boat Cover 12 Ft: How to Measure, Choose and Fit One (7 Steps)
• 4 Best 16 Foot Jon Boat Covers for Every Need (2026)
• 12ft Jon Boat Cover: How to Measure, Choose and Fit One Correctly
• Yamaha Boat Motor Cover Review: Is the Explore Land 600D Worth It?

About the author