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Yes, you can grow watermelon in Missouri, and plenty of gardeners across the Show-Me State do it every single summer.
The key is understanding Missouri’s climate, choosing the right varieties, and giving your watermelon plants enough heat and time to mature.
If you’ve been wondering whether growing watermelon in Missouri is worth the effort, the answer is a resounding yes.
Missouri sits in USDA hardiness zones 5b through 7a, which means long, hot summers are the norm in most parts of the state.
That heat is exactly what watermelons crave, since they originated in the deserts of southern Africa.
In this post, we’ll walk through how to grow watermelon in Missouri successfully, the best varieties to pick, and the common mistakes to avoid.
Let’s dig in.
Why You Can Grow Watermelon in Missouri
You can grow watermelon in Missouri because the state’s growing season offers the warmth and sunshine these plants need.
Here’s why it works so well:
1. Missouri Summers Are Hot Enough
Watermelons need soil temperatures above 70°F to germinate and consistent heat to thrive.
Missouri summers regularly push into the 90s, giving watermelon vines the baking conditions they love.
That long stretch of heat is why growing watermelon in Missouri is not just possible but often productive.
2. The Growing Season Is Long Enough
Most of Missouri enjoys 150 to 180 frost-free days, depending on your location.
That’s plenty of time for short-season watermelon varieties to ripen fully.
If you live in northern Missouri, you’ll want to lean toward faster-maturing types, while southern Missouri gardeners have a bit more flexibility.
3. Missouri Soil Can Be Amended Easily
Watermelons prefer sandy, well-draining soil, and while Missouri’s clay-heavy soil isn’t ideal out of the gate, it’s easy to fix.
Mix in compost, aged manure, or peat moss to loosen things up.
Raised beds are another great option for growing watermelon in Missouri, especially if your native soil drains poorly.
Best Watermelon Varieties to Grow in Missouri
Choosing the right variety is one of the biggest factors in whether you can grow watermelon in Missouri successfully.
Here are some top picks:
1. Sugar Baby
Sugar Baby is a classic icebox watermelon that matures in about 75 days.
It’s perfect for Missouri’s season length and produces sweet, compact fruit that’s easy to handle.
2. Crimson Sweet
Crimson Sweet takes around 85 days but rewards you with large, sugary melons.
It’s a favorite among Missouri gardeners who have the space for sprawling vines.
3. Black Diamond
If you’re in southern Missouri where summers run longer, Black Diamond is a great choice.
It needs about 90 days but delivers big, dark-skinned melons with deep red flesh.
4. Jubilee
Jubilee is another reliable option for growing watermelon in Missouri, maturing in roughly 80 days.
It’s known for its tolerance to heat and consistent yields.
Tips for Growing Watermelon in Missouri
Once you’ve picked your varieties, a few smart practices will make growing watermelon in Missouri much easier.
Here’s what to focus on:
1. Start Seeds Indoors
Missouri’s last frost usually lands in mid-April to early May.
Start your watermelon seeds indoors about three to four weeks before that date.
This gives your plants a head start so they can ripen before the first fall frost.
2. Plant in Full Sun
Watermelons need at least eight hours of direct sunlight daily.
Pick the sunniest spot in your garden, because shade will slow growth and reduce sweetness.
3. Water Deeply but Infrequently
Watermelons have deep roots and prefer a good soaking once or twice a week rather than daily sprinkles.
Consistent moisture while the fruit is developing helps prevent splitting.
4. Watch for Pests and Diseases
Missouri’s humidity can invite powdery mildew and cucumber beetles.
Keep vines spaced for airflow, and check leaves regularly so problems don’t spiral.
5. Harvest at the Right Time
Your watermelon is ready when the tendril nearest the fruit turns brown and dry.
The spot where the melon touches the ground should also shift from white to creamy yellow.
That’s your signal to pick it and enjoy the fruits of growing watermelon in Missouri.
So, Can You Grow Watermelon in Missouri?
You can grow watermelon in Missouri, and with the right varieties and a little planning, you’ll be harvesting sweet, homegrown melons by late summer.
Missouri’s hot summers, long growing season, and amendable soil make it a surprisingly great state for watermelon lovers.
Just start seeds indoors, plant in full sun, water deeply, and keep an eye out for pests.
Do that, and growing watermelon in Missouri will quickly become one of your favorite garden projects.