When should I plant Thai Basil in Zone 1b?

Start Thai Basil seeds indoors around Apr 13. Transplant outdoors after Jun 8. Expect first harvest around Jul 8.

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 Thai Basil in Zone 1b?

Yes. Thai Basil needs 40 days to harvest. Zone 1b has a 95-day growing season, which is sufficient. You can plant up to 2 successions.

Growing Thai Basil in Zone 1b

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

Planting Calendar

Indoor

Outdoor

Harvest

Apr 13Aug 28

Season: May 25 – Aug 28 (95 days) · Succession: plant every 3 weeks (up to 2x)

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest40

SunFull Sun

Frost ToleranceNone

Spacing4/sqft (6" apart)

When to Plant Thai Basil in Zone 1b

Start Seeds Indoors: Apr 13

Start Thai Basil seeds indoors around Apr 13 (6 weeks before last frost). Optimal germination temperature: 80°F. Germinates in 5–10 days.

Transplant Outdoors: Jun 8

Transplant Thai Basil seedlings outdoors after Jun 8. Wait until soil temperature reaches 60°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Jul 8

First harvest approximately Jul 8 (~30 days from transplant). Continue harvesting until first frost (Aug 28).

Thai Basil 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 Thai Basil Garden

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

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