Zone 4b planting calendar
Cool climate with a roughly 4.5-month frost-free season.
Coldest temps-25 to -20°F
Avg. last spring frostMay 10
Avg. first fall frostSep 22
Open the interactive calendar for Zone 4b →
What to plant in Zone 4b
| Crop | When to plant |
|---|---|
| Tomato | Start seeds indoors Mar 22–Apr 5 Transplant outdoors May 17–May 24 |
| Pepper | Start seeds indoors Mar 8–Mar 22 Transplant outdoors May 24–May 31 |
| Lettuce | Direct sow outdoors Apr 12–May 10 Direct sow outdoors Jul 28–Aug 11 |
| Carrot | Direct sow outdoors Apr 19–May 24 Direct sow outdoors Jul 14–Jul 28 |
| Bush Bean | Direct sow outdoors May 10–Jun 7 |
| Cucumber | Start seeds indoors Apr 19–Apr 26 Transplant outdoors May 17–May 24 Direct sow outdoors May 17–May 31 |
| Zucchini | Direct sow outdoors May 10–May 31 |
| Spinach | Direct sow outdoors Mar 29–Apr 26 Direct sow outdoors Jul 28–Aug 18 |
| Kale | Start seeds indoors Mar 29–Apr 12 Transplant outdoors Apr 26–May 10 Direct sow outdoors Apr 26–May 24 Direct sow outdoors Jun 30–Jul 28 |
| Pea | Direct sow outdoors Mar 29–Apr 19 |
| Basil | Start seeds indoors Mar 29–Apr 12 Transplant outdoors May 17–May 31 |
| Cilantro | Direct sow outdoors Apr 19–May 17 Direct sow outdoors Jul 28–Aug 18 |
| Broccoli | Start seeds indoors Mar 22–Apr 5 Transplant outdoors Apr 26–May 10 Direct sow outdoors Jun 16–Jul 7 |
| Cabbage | Start seeds indoors Mar 15–Mar 29 Transplant outdoors Apr 26–May 10 |
| Cauliflower | Start seeds indoors Mar 22–Apr 5 Transplant outdoors Apr 26–May 10 |
| Brussels Sprouts | Start seeds indoors Mar 29–Apr 12 Transplant outdoors May 3–May 17 |
| Onion | Start seeds indoors Mar 1–Mar 15 Transplant outdoors Apr 12–Apr 26 |
| Garlic | Direct sow outdoors Aug 25–Sep 8 |
| Beet | Direct sow outdoors Apr 12–May 10 Direct sow outdoors Jul 14–Jul 28 |
| Radish | Direct sow outdoors Apr 12–May 24 Direct sow outdoors Jul 28–Aug 25 |
| Swiss Chard | Direct sow outdoors Apr 26–May 24 |
| Potato | Direct sow outdoors Apr 26–May 24 |
| Sweet Corn | Direct sow outdoors May 10–May 31 |
| Eggplant | Start seeds indoors Mar 15–Mar 29 Transplant outdoors May 24–May 31 |
| Pumpkin | Direct sow outdoors May 10–May 31 |
| Winter Squash | Direct sow outdoors May 10–May 31 |
| Parsley | Start seeds indoors Mar 15–Mar 29 Transplant outdoors Apr 26–May 10 Direct sow outdoors Apr 26–May 24 |
| Dill | Direct sow outdoors Apr 26–May 24 Direct sow outdoors Jul 28–Aug 11 |
| Chives | Start seeds indoors Mar 15–Mar 29 Transplant outdoors Apr 26–May 10 |
| Thyme | Start seeds indoors Mar 15–Mar 29 Transplant outdoors May 10–May 24 |
| Oregano | Start seeds indoors Mar 15–Mar 29 Transplant outdoors May 10–May 24 |
| Sage | Start seeds indoors Mar 15–Mar 29 Transplant outdoors May 10–May 24 |
| Rosemary | Start seeds indoors Mar 1–Mar 15 Transplant outdoors May 24–Jun 7 |
| Mint | Transplant outdoors May 10–May 24 |
| Strawberry | Transplant outdoors Apr 12–Apr 26 |
| Watermelon | Start seeds indoors Apr 12–Apr 26 Transplant outdoors May 24–May 31 Direct sow outdoors May 17–May 31 |
| Cantaloupe | Start seeds indoors Apr 12–Apr 26 Transplant outdoors May 24–May 31 Direct sow outdoors May 17–May 31 |
| Ground Cherry | Start seeds indoors Mar 22–Apr 5 Transplant outdoors May 17–May 24 |
| Blueberry | Transplant outdoors Apr 12–Apr 26 |
| Raspberry | Transplant outdoors Apr 5–Apr 19 |
| Marigold | Start seeds indoors Mar 29–Apr 12 Transplant outdoors May 17–May 24 Direct sow outdoors May 10–May 24 |
| Zinnia | Start seeds indoors Apr 12–Apr 26 Transplant outdoors May 17–May 24 Direct sow outdoors May 10–May 24 |
| Sunflower | Direct sow outdoors May 10–May 31 |
| Cosmos | Direct sow outdoors May 10–May 24 |
| Nasturtium | Direct sow outdoors May 10–May 24 |
| Sweet Pea | Direct sow outdoors Mar 29–Apr 19 |
| Snapdragon | Start seeds indoors Mar 15–Mar 29 Transplant outdoors Apr 26–May 10 |
| Pansy | Start seeds indoors Mar 1–Mar 15 Transplant outdoors Apr 12–Apr 26 |
| Dahlia | Start seeds indoors Apr 12–Apr 26 Transplant outdoors May 17–May 24 |
| Calendula | Direct sow outdoors Apr 26–May 24 Direct sow outdoors Jul 28–Aug 11 |