How And When To Plant Watermelon

You can plant watermelon in late spring or early summer once the soil has warmed up and all danger of frost has passed.
 
If you’ve been wondering how and when to plant watermelon, the short answer is simple: plant watermelon seeds or transplants when nighttime temperatures stay above 50°F and the soil is at least 70°F.
 
Watermelon loves heat, so timing is everything when you plant watermelon.
 
In this post, we’ll walk through exactly how and when to plant watermelon so you get sweet, juicy fruit by the end of summer.
 
Let’s dig in.
 

When to Plant Watermelon

Knowing when to plant watermelon is the first step to a successful harvest.
 
Watermelon is a warm-season crop, and it will not tolerate cold soil or frost.
 
Here’s how to get the timing right.
 

1. Wait Until After the Last Frost

The best time to plant watermelon is about two weeks after your last expected spring frost.
 
Check your local frost dates, because planting watermelon too early can stunt or kill your seedlings.
 
If you plant watermelon when the ground is still cold, the seeds may rot before they sprout.
 

2. Soil Temperature Matters

You should plant watermelon only when the soil has reached at least 70°F (21°C) at a depth of four inches.
 
This is one of the most overlooked parts of when to plant watermelon.
 
Cold soil slows germination, and your plants will struggle to grow.
 
A simple soil thermometer takes the guesswork out of when to plant watermelon.
 

3. Start Seeds Indoors for a Head Start

If you live in a short growing season, you can plant watermelon seeds indoors three to four weeks before the last frost.
 
Then transplant them outside once the weather is consistently warm.
 
This gives you a jump on the season while still following the rule of when to plant watermelon outdoors.
 

How to Plant Watermelon

Now that you know when to plant watermelon, let’s talk about how to plant watermelon for the best results.
 
Getting the planting method right makes a big difference.
 

1. Choose the Right Spot

Watermelon needs full sun, so pick a spot that gets at least eight hours of direct sunlight.
 
When you plant watermelon, choose a location with plenty of space, because the vines spread wide.
 
Good airflow also helps prevent disease.
 

2. Prepare the Soil

Watermelon thrives in loose, well-draining soil rich in organic matter.
 
Before you plant watermelon, mix in compost and a balanced fertilizer.
 
The soil should be slightly acidic to neutral, around pH 6.0 to 6.8.
 
This prep work is key whenever you plant watermelon.
 

3. Plant Seeds or Transplants Correctly

If you plant watermelon from seed, sow them about one inch deep.
 
Space the seeds or transplants three to five feet apart in rows that are six to eight feet apart.
 
When you plant watermelon transplants, be gentle with the roots and water them in well.
 
Plant watermelon in small hills if your soil drains poorly, as this improves drainage and warmth.
 

4. Water and Mulch

After you plant watermelon, give them a deep watering.
 
Then add a layer of mulch to retain moisture and keep weeds down.
 
Consistent watering is important, especially while the plants are establishing.
 
Once you plant watermelon, aim for about one to two inches of water per week.
 

5. Watch for Pests and Pollination

When you plant watermelon, keep an eye out for pests like aphids and cucumber beetles.
 
Watermelon also needs bees for pollination, so avoid spraying harsh chemicals.
 
Healthy vines mean better fruit, so care for them from the moment you plant watermelon.
 

Tips for Growing Watermelon Successfully

Planting watermelon is just the beginning, and a few extra tips can boost your harvest.
 

1. Feed Them Well

Watermelon is a heavy feeder, so side-dress with fertilizer once the vines start running.
 
This keeps the plants strong after you plant watermelon.
 

2. Protect Young Plants

If a late cold snap threatens, cover your plants with row covers.
 
This protects the watermelon you plant until the weather settles.
 

3. Harvest at the Right Time

Watermelon is ready when the tendril nearest the fruit turns brown and the underside is creamy yellow.
 
From the day you plant watermelon, most varieties take 70 to 90 days to mature.
 

So, How and When to Plant Watermelon?

You plant watermelon in late spring or early summer once the soil is warm and frost is gone.
 
Timing and technique both matter, so plant watermelon when the soil hits 70°F and give the vines sun, space, and water.
 
Now that you know how and when to plant watermelon, you’re ready to grow your own sweet crop this season.