USDA Zone 3b planting calendar
In USDA Zone 3b, the average last spring frost is around 05/20 and the first fall frost around 09/19, giving roughly a 121-day growing season. Plant cool-season crops from late winter; warm-season crops after the last frost.
Last frost ~05/20
First frost ~09/19
~121-day season
11 NOAA stations
The year in Zone 3b
What to plant now (July)
Kale
Sow for fall harvest
Spinach
Sow for fall harvest
Swiss Chard
Sow for fall harvest
Radishes
Sow for fall harvest
Turnips
Sow for fall harvest
Beets
Sow for fall harvest
Peas
Sow for fall harvest
All crops in Zone 3b
| Crop | Start indoors | Transplant / sow | Sow for fall |
|---|---|---|---|
| Tomatoes | April 19 – April 26 | May 24 – June 7 | — |
| Peppers | April 8 | May 27 – June 10 | — |
| Eggplant | April 12 – April 26 | May 31 – June 14 | — |
| Basil | April 19 | May 24 – June 7 | — |
| Broccoli | April 1 – April 8 | April 22 – May 6 | June 10 – June 24 |
| Cabbage | March 11 – March 25 | April 15 – April 29 | May 1 – May 15 |
| Cauliflower | March 25 – April 8 | April 29 – May 13 | June 15 – June 29 |
| Brussels Sprouts | March 18 – April 1 | April 22 – May 6 | May 1 – May 15 |
| Kale | March 11 – March 25 | April 15 – April 29 | June 20 – July 4 |
| Lettuce | March 22 – March 29 | April 19 – May 3 | June 5 – June 19 |
| Spinach | — | April 12 – April 26 | July 15 – July 29 |
| Onions | February 11 – February 25 | April 15 – April 29 | — |
| Leeks | February 18 – March 4 | April 22 – May 6 | — |
| Swiss Chard | March 25 – April 1 | April 29 – May 13 | June 30 – July 14 |
| Radishes | — | April 22 – May 6 | July 30 – August 13 |
| Turnips | — | April 22 – May 6 | June 30 – July 14 |
| Beets | — | April 29 – May 13 | June 25 – July 9 |
| Carrots | — | May 13 – May 27 | May 26 – June 9 |
| Peas | — | April 8 – April 22 | June 20 – July 4 |
| Beans | — | May 20 – June 3 | — |
| Sweet Corn | — | May 20 – June 3 | — |
| Cucumbers | May 3 – May 10 | May 24 – June 7 | — |
| Summer Squash & Zucchini | May 6 – May 13 | May 27 – June 10 | — |
| Winter Squash | May 6 – May 13 | May 27 – June 10 | — |
| Pumpkins | May 6 – May 13 | May 27 – June 10 | — |
| Melons | May 6 – May 13 | May 27 – June 10 | — |
| Okra | April 29 – May 13 | June 3 – June 17 | — |
| Potatoes | — | May 3 – May 17 | — |
| Parsley | February 22 – March 1 | April 26 – May 10 | — |
Last verified 2026-07-16. Frost: NOAA NCEI 1991–2020 Climate Normals. Zone: USDA 2023 Plant Hardiness Zone Map (PRISM-derived). Planting rules: UNH Extension, Johnny's Selected Seeds, UGA Extension.