Whole Blacktail Mountain Watermelon with large slices and watermelon juice on a white background.
Watermelon Seeds, Blacktail Mountain
A cut up Blacktail Mountain Watermelon with melon balls on a pink background.
Woman cutting a Blacktail Mountain Watermelon on cutting board with a whole melon in the background.
A Blacktail Mountain Watermelon sliced in half laying on grass at the Baker Creek trial farm in California.
Whole Blacktail Mountain Watermelon with large slices and watermelon juice on a white background.
Watermelon Seeds, Blacktail Mountain
A cut up Blacktail Mountain Watermelon with melon balls on a pink background.
Woman cutting a Blacktail Mountain Watermelon on cutting board with a whole melon in the background.
A Blacktail Mountain Watermelon sliced in half laying on grass at the Baker Creek trial farm in California.

Watermelon Seeds,
Blacktail Mountain

4.266 ReviewsSKU: #WM129Min. seed count: 25
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Description

(Citrullus lanatus). One of the earliest watermelons we know; superb for the north, but it also grows well in heat and drought. The flesh is red and deliciously sweet. Fruit has a dark rind and weighs 8 to 12 lbs each. This excellent variety was developed by our friend Glenn Drowns, owner of the Sand Hill Preservation Center in Iowa. A favorite of many gardeners across the U.S. One of the best we have ever tried!

Growing Tips: Blacktail Mountain excels in regions with short summers, cool nights, and unpredictable weather. This variety benefits from black plastic mulch to warm the soil and encourage early growth. Water regularly but allow soil to dry slightly between waterings to prevent rot. Avoid nitrogen-heavy fertilizers; use balanced, organic options for best fruit development.

Plant Details

Botanical Name
Citrullus lanatus
Life Cycle
Annual
Growth Habit
Vining
Sun Requirement
Full sun
Days to Germinate
5–10
Days to Maturity
70–80
Planting Depth
1 in.
Plant Spacing
36–48 in.
Ideal Temperature
75–95°F
Frost Hardy
No

When to Grow

Start seeds indoors 3–4 weeks before your last frost date or direct sow once soil has reached at least 65°F. Blacktail Mountain is perfect for early sowing in colder zones thanks to its cold tolerance and early maturity. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow seeds 1 inch deep, directly into raised beds or hills spaced 3 feet apart. For indoor starts, transplant seedlings once they have two sets of true leaves and nighttime temperatures remain above 55°F. Use row covers early on to protect young plants from pests and temperature swings.

How to Grow

Keep soil evenly moist until fruit begins to ripen, then reduce watering to concentrate sugars. Apply compost or organic fertilizer when vines start to sprawl. This variety matures quickly, so monitor closely for ripeness—look for a yellow belly spot and drying tendril near the fruit.

How to Save Seeds

  • Allow fruits from healthy, true-to-type plants to fully ripen and cure on the vine.
  • Scoop seeds from the flesh and rinse in a strainer to remove pulp.
  • Spread seeds on a screen or paper towel in a warm, dry place out of direct sunlight for at least 7-10 days.
  • Stir daily to ensure even drying.
  • Once completely dry, store in an labeled, airtight container in a cool, dark place.

FAQ

Is Blacktail Mountain watermelon good for short growing seasons?

Yes, it's one of the best early-maturing varieties available, ripening in as little as 70 days. It was bred specifically to thrive in cooler climates with shorter summers.

Can I grow Blacktail Mountain in hot southern climates?

While it's best suited for cooler zones, Blacktail Mountain can still grow well in hotter areas. Just be sure to provide consistent watering and harvest promptly to avoid overripe fruit.

How large do Blacktail Mountain watermelons get?

Fruits typically weigh 8–12 pounds, making them a convenient size for small families. Despite their smaller size, the flavor is rich, sweet, and satisfying, even in cooler climates.

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