Can You Grow Watermelon In Minnesota

Yes, you can grow watermelon in Minnesota, and plenty of gardeners do it successfully every summer.
 
The trick is choosing the right varieties, starting early enough, and giving your plants the warm conditions they crave.
 
Minnesota has a shorter growing season than places like Georgia or Texas, so you can’t just toss seeds in the ground in late May and hope for the best.
 
If you’ve been wondering whether you can grow watermelon in Minnesota, the answer is a confident yes with a little planning.
 
In this post, we’ll walk through how to grow watermelon in Minnesota, from picking cold-hardy varieties to harvesting sweet, ripe fruit before the first frost.
 

Why You Can Grow Watermelon in Minnesota

You can grow watermelon in Minnesota because the state’s long, sunny summer days give melons the heat and light they need to thrive.
 
Minnesota may have cold winters, but its summers are surprisingly warm, with daytime temps often hitting the 80s and 90s.
 
Watermelons love that kind of heat, and they grow fast when conditions are right.
 
The main challenge is the length of the season, not the temperature itself.
 
Most watermelons need 80 to 100 days to mature, and Minnesota’s growing season runs about 120 to 140 days depending on where you live.
 
That means you can grow watermelon in Minnesota, but you need to stack the odds in your favor.
 
Here’s why it works:
 

1. Long Summer Daylight Hours

Minnesota gets up to 15 hours of daylight in June and July, which pushes watermelon vines to grow quickly.
 
More sun means more photosynthesis, and that translates to bigger, sweeter fruit.
 

2. Warm Summer Soil

Watermelons need soil temperatures above 70°F to germinate and grow well.
 
By late June, Minnesota soil warms up enough to support vigorous growth, especially if you use black plastic mulch.
 

3. Short-Season Varieties Exist

You can grow watermelon in Minnesota thanks to varieties bred for cooler climates.
 
Types like ‘Blacktail Mountain,’ ‘Sweet Dakota Rose,’ and ‘Yellow Doll’ mature in as little as 70 to 80 days.
 
That’s fast enough to beat the first fall frost in most parts of the state.
 

How to Grow Watermelon in Minnesota Successfully

To grow watermelon in Minnesota, you need to start seeds indoors, warm the soil, and protect plants from cold snaps.
 
Here’s a step-by-step approach that works for Minnesota gardeners.
 

1. Start Seeds Indoors in April

Begin watermelon seeds indoors about three to four weeks before your last frost date.
 
In Minnesota, that’s usually mid-to-late April.
 
Use peat pots or biodegradable containers so you don’t disturb the roots when transplanting.
 
Keep them in a warm spot, ideally 75–85°F, and give them plenty of light.
 

2. Harden Off Before Transplanting

Before you move seedlings outside, harden them off over a week.
 
Set them out for a few hours each day, gradually increasing their time outdoors.
 
This prevents shock and helps them adapt to Minnesota’s variable spring weather.
 

3. Wait Until Soil Is Warm

Don’t transplant until the soil is at least 70°F and all danger of frost has passed.
 
In Minnesota, that’s typically late May to early June.
 
If you plant too early, cold soil can stunt or kill your watermelon seedlings.
 

4. Use Black Plastic Mulch

Black plastic mulch is a game-changer for growing watermelon in Minnesota.
 
It warms the soil, conserves moisture, and keeps weeds down.
 
Lay it a week or two before transplanting to pre-warm the ground.
 

5. Choose a Sunny, Sheltered Spot

Plant your watermelons in the sunniest part of your garden.
 
A south-facing slope or a spot near a wall that radiates heat works well.
 
Avoid low areas where cold air settles.
 

Best Watermelon Varieties for Minnesota

If you want to grow watermelon in Minnesota, pick short-season varieties that ripen quickly.
 
Here are some top choices:
 

1. Blacktail Mountain

This variety matures in about 70 days and produces sweet, dark green melons.
 
It was bred specifically for short growing seasons.
 

2. Sweet Dakota Rose

Ready in 65–75 days, this one thrives in cooler climates and has a firm, sugary flesh.
 

3. Yellow Doll

A small, yellow-fleshed watermelon that ripens in 70–80 days.
 
Great for Minnesota gardens because it’s compact and early.
 

4. Sugar Baby

This classic icebox watermelon matures in about 75–80 days and does well in northern states.
 

Care Tips for Growing Watermelon in Minnesota

Once your plants are in the ground, keep them happy with consistent water and warmth.
 
Water deeply once a week, aiming for about an inch of moisture.
 
Avoid overhead watering to prevent fungal diseases.
 
Feed with a balanced fertilizer early on, then switch to a low-nitrogen blend when flowers appear.
 
If temperatures drop below 50°F at night, cover plants with row covers or blankets.
 
Hand-pollinate if you notice few bees, since Minnesota’s bee activity can vary.
 
And when fruits start forming, place a board or straw underneath them to keep them off the soil.
 

So, Can You Grow Watermelon in Minnesota?

Yes, you can grow watermelon in Minnesota with the right varieties, early planting, and a little extra care.
 
Minnesota’s warm summers and long daylight hours give watermelons what they need to thrive.
 
Just start seeds indoors, warm the soil with black plastic, and choose short-season types like Blacktail Mountain or Sugar Baby.
 
With those steps, you can grow watermelon in Minnesota and enjoy homegrown slices before the frost hits.