When To Plant Watermelons In Arkansas

Knowing when to plant watermelons in Arkansas is the first step to a successful harvest. Getting the timing right means your plants will thrive in the warm season they love, leading to sweet, juicy fruit later in the summer.

This guide gives you the simple, practical advice you need. We’ll cover the best dates, how to prepare your soil, and tips for choosing the right variety for your garden.

The short answer is to plant after the last spring frost when the soil is warm. For most of Arkansas, this means from mid-April through late May.

Watermelons are very sensitive to cold. Planting too early can stunt growth or kill the seedlings. The goal is to have them growing actively when the hot, long days of an Arkansas summer arrive.

Understanding Your Arkansas Planting Zone

Arkansas spans USDA Hardiness Zones 6b through 8a. This affects your specific last frost date:

Zone 6b (Northwest AR): Last frost around April 15-25. Aim to plant from late April to early June.
Zone 7a & 7b (Central AR, including Little Rock): Last frost around April 1-15. Planting from mid-April through May is ideal.
Zone 8a (Southern AR): Last frost around March 22-31. You can often start as early as early to mid-April.

Always check your local frost dates. A good rule is to wait until soil temperatures are consistently above 70°F. You can use a simple soil thermometer to check this.

Starting Seeds Indoors vs. Direct Sowing

You have two main options for getting your watermelon plants started. Each has it’s pros and cons.

Starting Seeds Indoors

This gives you a head start, especially in cooler northern zones. Start seeds about 3-4 weeks before your planned outdoor transplant date.

Use biodegradable pots to avoid disturbing roots later.
Plant seeds ½ inch deep in a seed-starting mix.
Keep them warm (75-85°F) and under a grow light.
Transplant outdoors after hardening off, when plants have 2-3 true leaves.

Direct Sowing in the Garden

This is the simplest method and works well in warmer areas. Plant seeds directly into your garden bed once the soil is warm.

Create small mounds or hills of soil, about 3 feet apart.
Plant 4-6 seeds per mound, 1 inch deep.
Once seedlings emerge, thin to the 2-3 strongest plants per mound.

Direct sowing is less disruptive to the plants roots, which watermelon seedlings appreciate.

Preparing Your Garden Bed

Watermelons need full sun—at least 8 hours of direct sunlight per day. The soil preparation is crucial for healthy vines and large fruit.

Soil Type: They prefer sandy loam that drains well but retains some moisture. If you have heavy clay soil, amend it with compost.
pH Level: Aim for a soil pH between 6.0 and 6.8. A simple soil test can tell you if you need to adjust it.
Nutrients: Mix in several inches of aged compost or well-rotted manure before planting. Avoid high-nitrogen fertilizers, which promote leaves over fruit.
Space: Vines need room to run! Allow at least 6-8 feet between rows, with mounds 3-4 feet apart within the row.

Choosing the Right Watermelon Varieties for Arkansas

Selecting a variety suited to Arkansas’s climate and your garden size is key. Consider days to maturity, which is how long from planting to harvest.

Early Season (70-80 days): ‘Sugar Baby’ (icebox type), ‘Golden Midget’. Good for shorter growing seasons or fall planting attempts.
Mid-Season (80-90 days): ‘Crimson Sweet’, ‘Charleston Gray’. Reliable and well-suited for most of Arkansas.
Large & Long Season (90+ days): ‘Black Diamond’, ‘Jubilee’. Need a long, hot summer but produce very large fruit.
Seedless Varieties: Like ‘Triple Sweet’. Remember, these require a seeded pollinator variety planted nearby to produce fruit.

Caring for Your Watermelon Plants

Once planted, consistent care will get you to harvest. Pay close attention to watering and weeding.

Watering Schedule

Watermelons need deep, consistent watering, especially during fruit set and growth. About 1-2 inches per week is a good goal.

Use drip irrigation or soaker hoses to keep leaves dry and prevent disease. Reduce watering as the fruits mature to concentrate sugars for better flavor.

Fertilizing

Side-dress with a balanced, low-nitrogen fertilizer when vines begin to run. Another application when fruits first appear can be helpful. Too much nitrogen late in the season can effect fruit quality.

Pest and Disease Management

Common issues in Arkansas include cucumber beetles, squash bugs, and aphids. Powdery mildew and fusarium wilt are fungal diseases to watch for.

Use row covers early to protect young plants from insects.
Practice crop rotation—don’t plant melons in the same spot year after year.
Choose disease-resistant varieties when possible.
Remove any badly infected plants to prevent spread.

Signs Your Watermelons Are Ready to Harvest

Harvest time is the best part! Most varieties are ready 80-100 days after planting. Here’s how to tell if they’re ripe:

The Curly Tendril: Look at the curly tendril closest to the fruit stem. When it turns brown and dries up, the melon is usually ripe.
The Ground Spot: The spot where the melon rests on the ground changes from white to a creamy yellow.
Sound Test: Thump the melon. A ripe one will have a deep, hollow sound. An unripe one sounds more tight and metallic.
Skin Sheen: The skin loses its glossy shine and becomes dull.

Use a sharp knife to cut the stem, leaving about an inch attached to the fruit.

Can You Plant a Second Crop in Arkansas?

In southern Arkansas (Zone 8a), you might succesfully plant a second, late-summer crop for a fall harvest. Aim to plant seeds around early to mid-July.

Choose an early-maturing variety like ‘Sugar Baby’. Ensure you have enough warm days left (check the ‘days to maturity’ on the seed packet) before the first fall frost. This is a more advanced technique but can extend your harvest.

Frequently Asked Questions (FAQ)

What is the latest you can plant watermelons in Arkansas?

For a main crop, late June is generally the absolute latest for central Arkansas. Southern areas can push into early July with early varieties.

Can I plant watermelon seeds from a store-bought melon?

You can, but it’s not recommended. Many are hybrids that won’t grow true, and they may not be adapted to your local climate. It’s better to buy seeds from a reputable supplier.

How do I protect young watermelon plants from a late cold snap?

Use floating row covers, cloches, or even old milk jugs with the bottoms cut out to protect seedlings. Remove them during the day once temperatures warm back up.

Why are my watermelon vines flowering but not producing fruit?

This is often a pollination issue. Watermelons have separate male and female flowers. If bees are scarce, you can try hand-pollinating by transferring pollen from a male flower to a female flower with a small brush.

What should I plant next to watermelons?

Good companions include corn, radishes, and marigolds. Avoid planting them near potatoes, as they can compete for resources.

By following these timing and care guidelines, you’ll give your Arkansas watermelon patch the best start. With a little patience and attention, you’ll be rewarded with the perfect, homegrown treat for a hot summer day.