If you’re planning to grow watermelon in Arkansas, timing is the most critical factor for a successful harvest. Knowing exactly when to plant watermelon in Arkansas can mean the difference between sweet, juicy fruit and a disappointing crop.
Our state’s unique climate, with its hot summers and variable spring weather, requires a specific schedule. This guide will walk you through the optimal windows, variety selection, and simple steps to get your watermelon patch thriving.
When to Plant Watermelon in Arkansas
The safest time to plant watermelon in Arkansas is after the last spring frost has passed and the soil has thoroughly warmed. For most of the state, this falls between late April and mid-May.
Planting too early in cold soil will stunt growth or kill the seeds. Waiting for consistent warmth is key. You can use these general date ranges as a starting point:
- Southern Arkansas: April 20 – May 10
- Central Arkansas: April 25 – May 15
- Northern Arkansas: May 1 – May 20
Always verify your local last frost date. A good rule is to wait until soil temperatures at a 4-inch depth are consistently at least 70°F. You can check this with a simple soil thermometer.
Understanding Arkansas Growing Zones
Arkansas spans USDA plant hardiness zones 6b through 8a. This range affects your planting schedule and which watermelon varieties will perform best.
- Zone 6b (Northwest): Shorter growing season. Start seeds indoors 2-3 weeks before the outdoor planting date to get a head start.
- Zone 7a & 7b (Central): The prime watermelon growing region. A long, hot season perfect for most varieties.
- Zone 8a (South): The longest season. You can often plant a bit earlier and even succession plant for a extended harvest.
Choosing the Right Watermelon Variety
Picking a variety suited to Arkansas’s climate is just as important as timing. Consider days to maturity and disease resistance.
For a Classic Favorite: ‘Crimson Sweet’ is highly reliable, disease-resistant, and produces large, sweet fruit in about 85 days.
For Smaller Gardens: ‘Sugar Baby’ or ‘Black Diamond’ are excellent icebox types. They mature faster, often in 75-80 days, which is great for zones with a slightly shorter season.
For Something Unique: Try a yellow-fleshed variety like ‘Yellow Doll’ (70-75 days) or a seedless type. Remember, seedless varieties require a pollinator variety planted nearby.
Step-by-Step Planting Guide
1. Preparing Your Soil
Watermelons need deep, well-drained, sandy loam soil with a pH between 6.0 and 6.8. They are heavy feeders, so proper preparation is essential.
- Choose a full-sun location (8+ hours daily).
- Loosen the soil to a depth of at least 12 inches.
- Mix in 3-4 inches of aged compost or well-rotted manure.
- You can also add a balanced, slow-release fertilizer according to package instructions.
2. Planting Seeds Directly
This is the preferred method in Arkansas, as watermelons have sensitive roots that don’t always transplant well.
- Create mounds or hills of soil about 3 feet in diameter and 6 inches high. Space hills 6-8 feet apart for vining types, 3-4 feet for bush types.
- Plant 4-6 seeds per hill, about 1 inch deep.
- Water the seeds in gently but thoroughly.
- Once seedlings have two sets of true leaves, thin to the 2-3 strongest plants per hill.
3. Using Transplants
If you want an earlier start or live in a cooler zone, you can use transplants. Handle them with care to avoid root shock.
- Start seeds indoors in biodegradable pots about 3-4 weeks before your outdoor planting date.
- Harden off seedlings for a week before transplanting.
- Plant the entire pot into your prepared hill, being careful not to disturb the root ball.
Caring for Your Watermelon Plants
Consistent care through the season ensures healthy vines and the sweetest fruit.
Watering: Provide 1-2 inches of water per week. Water at the base of the plant, not the leaves, to prevent disease. Deep, infrequent watering is better than frequent light sprinklings. Reduce watering as the fruit ripens for better flavor.
Mulching: Apply a layer of straw or pine straw mulch around plants. This conserves moisture, suppresses weeds, and keeps the developing fruit clean and off the damp soil.
Fertilizing: Side-dress with a nitrogen fertilizer when vines begin to run. Switch to a phosphorus and potassium-rich fertilizer as flowers and fruit set to support development.
Common Pests and Problems in Arkansas
Stay vigilant for these typical issues. Catching them early makes management easier.
- Cucumber Beetles: These spread bacterial wilt. Use row covers early in the season or apply appropriate organic controls.
- Aphids: Blast them off with water or use insecticidal soap.
- Powdery Mildew: A fungal disease that looks like white powder on leaves. Choose resistant varieties and ensure good air circulation. Fungicides can be used if needed.
- Blossom End Rot: Caused by calcium deficiency and irregular watering. Maintain consistent soil moisture to prevent it.
How to Know When Your Watermelon is Ripe
Harvest time is the best part! Use these three reliable signs to pick your watermelon at peak sweetness.
- The Curly Tendril Dries: The small, curly tendril on the stem near where the fruit attaches will turn brown and dry when the melon is ripe.
- The Ground Spot Turns Yellow: The spot where the melon rests on the ground changes from white to a creamy yellow.
- It Sounds Hollow: Give it a firm thump. A ripe melon will have a deep, hollow sound, while an underripe one will sound solid.
Use a sharp knife or pruners to cut the stem, leaving about an inch attached to the fruit. They don’t continue to ripen off the vine, so accurate timing is important.
FAQ: Planting Watermelons in Arkansas
Can I plant watermelon in June in Arkansas?
Yes, but it’s pushing the limit. Early June plantings of fast-maturing varieties (70-80 days) can succeed in central and southern Arkansas, especially if our fall is long and mild. Later plantings risk the fruit maturing in cooler fall weather, which affects taste.
What is the latest date to plant watermelons?
Aim to plant so the fruit matures before your first average fall frost. Count back the “days to maturity” on your seed packet from that frost date. For a late variety needing 90 days in zone 7, late June is likely the absolute latest.
How long does it take to grow a watermelon?
Most varieties need 80-90 days from planting to harvest. Some smaller “icebox” types can be ready in as little as 70 days, while very large heirloom may need over 100 days of warm weather.
Can I grow watermelon in a container?
You can, but choose a compact “bush” variety and a very large container (at least 20 gallons). Ensure it has excellent drainage and be prepared to water and fertilize frequently, as containers dry out fast.
By following this schedule and tips, you’ll be well on your way to harvesting your own delicious, sun-ripened watermelons. There’s nothing quite like the taste of a melon you’ve grown yourself, picked at the perfect moment from your own garden.