When should I plant Sweet Potato in Zone 1b?

Start Sweet Potato seeds indoors around Mar 30. Transplant outdoors after Jun 15. Expect first harvest around Sep 13.

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 Sweet Potato in Zone 1b?

Zone 1b has a 95-day growing season, which may be too short for Sweet Potato (100 days needed). Consider short-season varieties or season extension techniques.

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🍠 Growing Sweet Potato in Zone 1b

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

Season Too Short

Sweet Potato needs 100 days to harvest, but Zone 1b has only a 95-day growing season. Consider short-season varieties or season extension techniques (cold frames, row covers).

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest100

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sweet Potato in Zone 1b

Start Seeds Indoors: Mar 30

Start Sweet Potato seeds indoors around Mar 30 (8 weeks before last frost). Optimal germination temperature: 85°F. Germinates in 14–21 days.

Transplant Outdoors: Jun 15

Transplant Sweet Potato seedlings outdoors after Jun 15. Wait until soil temperature reaches 65°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Sep 13

First harvest approximately Sep 13 (~90 days from transplant). Continue harvesting until first frost (Aug 28).

Companion Planting

✅ Dill ✅ Oregano ✅ Thyme

Sweet Potato 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

Plan Your Sweet Potato Garden

Track Sweet Potato from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Sweet Potato Growing Guide