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Yes, you can grow watermelon in Maine.
It’s not the easiest crop to grow here, but with the right variety and a little planning, growing watermelon in Maine is absolutely possible.
Maine has a shorter growing season than traditional watermelon country down south, so the key is choosing fast-maturing varieties and giving your plants a strong head start.
If you’ve ever wondered “can you grow watermelon in Maine,” the short answer is yes, and the long answer is full of helpful tips that make it work.
In this post, we’ll look at how to grow watermelon in Maine, which varieties do best, and how to keep your vines happy from seed to harvest.
Let’s dig in.
Can You Grow Watermelon in Maine?
You can grow watermelon in Maine, and plenty of gardeners do it successfully every summer.
The catch is that Maine sits in USDA hardiness zones 3 to 6, which means cool nights and a relatively short frost-free window.
Watermelons love heat, sunshine, and a long stretch of warm weather, so growing watermelon in Maine takes a bit more strategy than tossing seeds in the ground and walking away.
The good news is that modern cultivars have been bred to ripen in as little as 70 to 85 days, which fits nicely into a Maine summer.
If you treat your watermelon plants like the heat-loving divas they are, you’ll be slicing into homegrown fruit by late summer.
1. Choose Short-Season Watermelon Varieties
The single most important step for growing watermelon in Maine is picking the right variety.
Look for “early” or “short-season” watermelons that mature in 85 days or fewer.
‘Sugar Baby’ is a classic choice that produces small, sweet fruit in about 75 days.
‘Blacktail Mountain’ was literally developed for cool, short-season climates and ripens in around 70 days.
‘Sweet Dakota Rose’ is another cold-tolerant option that many northern gardeners swear by.
Stay away from giant, long-season varieties like ‘Charleston Gray’ unless you have a greenhouse and a lot of patience.
2. Start Seeds Indoors
Because Maine’s season is short, starting watermelon seeds indoors is almost mandatory.
Begin seeds about three to four weeks before your last expected frost date.
In most of Maine, that means starting seeds in late April or early May.
Use biodegradable pots so you don’t disturb the roots when transplanting, since watermelons hate having their roots messed with.
Keep the seedlings warm, around 75 to 80°F, and give them plenty of light so they grow sturdy instead of leggy.
3. Wait for Warm Soil Before Transplanting
Watermelons will sulk, stunt, or rot if you plant them in cold soil.
Don’t transplant until the soil temperature is at least 60°F, and preferably closer to 70°F.
In Maine, that usually means waiting until early to mid-June, well after the last frost.
You can warm up your soil faster by covering the planting bed with black plastic mulch a couple of weeks before transplanting.
This trick is a game-changer for growing watermelon in Maine because it traps heat and keeps the roots cozy.
How to Grow Watermelon in Maine Successfully
Once your plants are in the ground, the real work of growing watermelon in Maine begins.
Here’s how to keep them thriving through the season.
1. Give Them Full Sun and Heat
Watermelons need at least eight hours of direct sunlight every day.
Plant them in the sunniest spot you have, ideally against a south-facing wall or fence that radiates warmth.
You can also use row covers or low tunnels early in the season to boost heat and protect against cool nights.
Just remember to remove the covers once flowers appear so pollinators can get in.
2. Water Deeply but Carefully
Watermelons have deep roots and prefer consistent moisture, not soggy soil.
Water deeply once or twice a week, aiming for about an inch of water each time.
Try to water at the base of the plant rather than the leaves, since wet foliage invites mildew, which is a real risk in Maine’s humid summers.
As the fruit ripens, cut back on watering slightly to concentrate the sugars and boost flavor.
3. Feed and Mulch
Watermelons are heavy feeders, so mix compost or a balanced fertilizer into the soil before planting.
Side-dress with more compost once vines start running.
Mulching with straw or black plastic helps retain warmth and moisture while keeping weeds down.
Weeds compete hard with young watermelon plants, so stay on top of them early.
4. Hand-Pollinate if Needed
Maine’s cool, rainy spells can keep bees away, which means fewer pollinated flowers and fewer melons.
If you notice flowers dropping without setting fruit, you can hand-pollinate by transferring pollen from male to female flowers with a small brush.
Female flowers have a tiny bulge at the base that looks like a mini watermelon, while male flowers don’t.
When to Harvest Watermelon in Maine
Harvest time for watermelon in Maine usually lands in late August or September, depending on the variety and the weather.
Here’s how to know when your melon is ready.
1. Check the Tendril and Color
The tendril closest to the fruit turns brown and dries up when the melon is ripe.
The spot where the melon rests on the ground also shifts from white to a creamy yellow.
2. Listen for the Thump
Give the melon a firm knock.
A ripe watermelon sounds deep and hollow, while an unripe one sounds dull and solid.
3. Watch the Clock
Keep track of your variety’s days to maturity and mark your calendar.
Once you’re within a week of that date, start checking daily, because watermelon can go from perfect to overripe fast.
So, Can You Grow Watermelon in Maine?
You can grow watermelon in Maine, and with the right variety, a warm planting spot, and a little patience, you’ll be rewarded with sweet, homegrown fruit.
Growing watermelon in Maine comes down to beating the cold, choosing fast-maturing seeds, starting them indoors, and keeping the soil warm and sunny all season.
It’s a challenge, but it’s a fun one, and biting into a melon you grew yourself in a Maine garden makes every bit of effort worth it.
Give it a try this summer and see for yourself.