Zone 1b Planting Calendar
Zone 1b has an average minimum temperature range of -55°F to -50°F. The average last spring frost is around June 7 and the first fall frost is around August 25, giving you approximately 79 days in the growing season.
There are 3 plants in our database that grow well in Zone 1b.
States That Include Zone 1b
Many states span multiple zones. The states highlighted below contain areas classified as Zone 1b.
Growing Season Comparison
What to Plant Right Now in Zone 1b
Based on April 2026 planting windows.
All Planting Windows at a Glance
This chart shows when to start, transplant, sow, and harvest every plant in Zone 1b.
Vegetables for Zone 1b
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Cabbage | Apr 26 | May 31 | Jun 7 | Aug 9 – Oct 4 | 60–100 |
| Microgreens | Apr 26 | May 31 | Jun 7 | Jun 14 – Jul 12 | 7–21 |
| Savoy Cabbage | Apr 26 | May 31 | Jun 7 | Aug 16 – Oct 11 | 70–110 |
Recommended for Your Garden
Full-spectrum LED lights for starting seeds indoors when daylight is limited.
Warm soil for faster germination of heat-loving crops like tomatoes and peppers.
Protect plants from frost, wind, and pests while letting light and water through.
Frequently Asked Questions
What can I grow in Zone 1b?
Zone 1b supports 3 plants in our database including vegetables, herbs, fruits, and flowers. With a 79-day growing season (last frost ~June 7, first frost ~August 25), you can grow most common garden crops with proper timing.
What is Zone 1b?
USDA Zone 1b has an average annual minimum temperature of -55°F to -50°F.
When is the last frost in Zone 1b?
The average last spring frost in Zone 1b is approximately June 7. The first fall frost averages around August 25, giving a growing season of about 79 days. These dates are based on 50% probability — plan for some year-to-year variation.
