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How long for a watermelon to ripen depends on a few key factors, including the variety you’re growing, the climate in your area, and how you care for the plant throughout the season.
Generally speaking, watermelons take anywhere from 70 to 100 days to ripen after planting, though some varieties can take as little as 65 days or as long as 120 days.
If you’ve been asking yourself “how long for a watermelon to ripen” as you watch your vines sprawl across the garden, you’re in the right place.
In this post, we’ll explore how long it takes for a watermelon to ripen, the signs to look for, and tips to speed up the process so you can enjoy sweet, juicy fruit sooner.
Let’s dive in.
How Long For a Watermelon to Ripen: The Timeline
How long for a watermelon to ripen varies depending on several factors, but here’s a general breakdown of what to expect:
1. Days to Maturity by Variety
Different watermelon varieties have different maturation times.
Smaller varieties like Sugar Baby can ripen in as little as 70 to 75 days.
Larger varieties like Charleston Gray or Crimson Sweet typically take 85 to 95 days.
So when you’re wondering how long for a watermelon to ripen, the answer really starts with the seed packet.
2. Climate and Growing Conditions
Watermelons thrive in warm weather, and how long for a watermelon to ripen is heavily influenced by temperature.
In hot climates with plenty of sunshine, watermelons can ripen faster, sometimes in as little as 65 to 70 days.
In cooler regions, the process slows down, and you might wait 100 days or more.
3. Soil and Watering
Healthy soil and consistent watering play a big role in how long for a watermelon to ripen.
Watermelons need well-draining soil rich in organic matter and regular watering, especially during flowering and fruit development.
Stress from drought or poor soil can delay ripening significantly.
Signs That a Watermelon Is Ripe
Knowing how long for a watermelon to ripen is helpful, but you also need to recognize when it’s actually ready.
Here are the telltale signs:
1. The Tendril Test
Look at the tendril closest to the fruit.
When it turns brown and dry, the watermelon is likely ripe.
This is one of the most reliable indicators of how long for a watermelon to ripen has passed.
2. The Hollow Sound
Give the watermelon a gentle knock.
A ripe watermelon sounds hollow, like a deep thump.
An unripe one sounds dull, while an overripe one sounds flat.
3. The Field Spot
Flip the watermelon over and look for the field spot, the patch where it rested on the ground.
If it’s creamy yellow, the watermelon is ripe.
If it’s white or green, it needs more time.
4. Weight and Shape
A ripe watermelon feels heavy for its size because it’s full of water.
It should also have a symmetrical shape without bumps or soft spots.
How to Speed Up Watermelon Ripening
If you’re impatient and wondering how long for a watermelon to ripen, there are a few tricks to nudge things along:
1. Reduce Watering Near Harvest
As the watermelon approaches maturity, cut back on watering.
This stress signals the plant to focus its energy on ripening the fruit rather than producing more leaves.
2. Rotate the Fruit
Gently rotate the watermelon every few days so all sides get even sun exposure.
This helps it ripen more evenly and can shave a few days off how long for a watermelon to ripen.
3. Provide Plenty of Sunlight
Watermelons need at least 6 to 8 hours of direct sunlight daily.
If your vines are shaded, prune back excess foliage to let more light reach the fruit.
4. Use Black Plastic Mulch
Black plastic mulch warms the soil and speeds up growth.
Warmer soil means faster development, which shortens how long for a watermelon to ripen.
Common Mistakes That Delay Ripening
Even if you know how long for a watermelon to ripen, mistakes can set you back.
Here are a few to avoid:
1. Overwatering
Too much water late in the season can cause the fruit to split or taste bland.
2. Harvesting Too Early
Picking a watermelon before it’s fully ripe means it won’t develop the sweetness you’re hoping for.
3. Ignoring Pest Damage
Aphids, squash bugs, and other pests can weaken the plant and delay ripening.
Keep an eye out and treat infestations promptly.
So, How Long For a Watermelon to Ripen?
How long for a watermelon to ripen typically ranges from 70 to 100 days, depending on the variety, climate, and care.
Watch for the signs of ripeness, like the brown tendril, hollow sound, and creamy field spot.
And with a little patience and the right conditions, you’ll be rewarded with a sweet, juicy watermelon that was worth the wait.