When should I plant Watermelon in Zone 1b?

Start Watermelon seeds indoors around Apr 27. Transplant outdoors after Jun 8. Expect first harvest around Aug 22.

What is the last frost date for Zone 1b?

The average last spring frost date for Zone 1b is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Watermelon in Zone 1b?

Yes. Watermelon needs 90 days to harvest. Zone 1b has a 95-day growing season, which is sufficient.

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🍉 Growing Watermelon in Zone 1b

Zone 1b has harsh winters and a short growing season. Start Watermelon early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 27Aug 28

Season: May 25 – Aug 28 (95 days)

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Watermelon in Zone 1b

Start Seeds Indoors: Apr 27

Start Watermelon seeds indoors around Apr 27 (4 weeks before last frost). Optimal germination temperature: 85°F. Germinates in 4–12 days.

Transplant Outdoors: Jun 8

Transplant Watermelon seedlings outdoors after Jun 8. Wait until soil temperature reaches 70°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Aug 22

First harvest approximately Aug 22 (~75 days from transplant). Continue harvesting until first frost (Aug 28).

Companion Planting

✅ Corn✅ Nasturtiums✅ Marigolds✅ Radishes

❌ Potatoes❌ Cucumbers

Watermelon in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

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