Zone 1a planting calendar
Arctic; an extremely short frost-free window. Stick to the hardiest greens and fast transplants under cover.
Coldest temps-60 to -55°F
Avg. last spring frostJun 15
Avg. first fall frostAug 15
Open the interactive calendar for Zone 1a →
What to plant in Zone 1a
| Crop | When to plant |
|---|---|
| Tomato | Start seeds indoors Apr 27–May 11 Transplant outdoors Jun 22–Jun 29 |
| Pepper | Start seeds indoors Apr 13–Apr 27 Transplant outdoors Jun 29–Jul 6 |
| Lettuce | Direct sow outdoors May 18–Jun 15 Direct sow outdoors Jun 20–Jul 4 |
| Carrot | Direct sow outdoors May 25–Jun 29 Direct sow outdoors Jun 6–Jun 20 |
| Bush Bean | Direct sow outdoors Jun 15–Jul 13 |
| Cucumber | Start seeds indoors May 25–Jun 1 Transplant outdoors Jun 22–Jun 29 Direct sow outdoors Jun 22–Jul 6 |
| Zucchini | Direct sow outdoors Jun 15–Jul 6 |
| Spinach | Direct sow outdoors May 4–Jun 1 Direct sow outdoors Jun 20–Jul 11 |
| Kale | Start seeds indoors May 4–May 18 Transplant outdoors Jun 1–Jun 15 Direct sow outdoors Jun 1–Jun 29 Direct sow outdoors May 23–Jun 20 |
| Pea | Direct sow outdoors May 4–May 25 |
| Basil | Start seeds indoors May 4–May 18 Transplant outdoors Jun 22–Jul 6 |
| Cilantro | Direct sow outdoors May 25–Jun 22 Direct sow outdoors Jun 20–Jul 11 |
| Broccoli | Start seeds indoors Apr 27–May 11 Transplant outdoors Jun 1–Jun 15 Direct sow outdoors May 9–May 30 |
| Cabbage | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 1–Jun 15 |
| Cauliflower | Start seeds indoors Apr 27–May 11 Transplant outdoors Jun 1–Jun 15 |
| Brussels Sprouts | Start seeds indoors May 4–May 18 Transplant outdoors Jun 8–Jun 22 |
| Onion | Start seeds indoors Apr 6–Apr 20 Transplant outdoors May 18–Jun 1 |
| Garlic | Direct sow outdoors Jul 18–Aug 1 |
| Beet | Direct sow outdoors May 18–Jun 15 Direct sow outdoors Jun 6–Jun 20 |
| Radish | Direct sow outdoors May 18–Jun 29 Direct sow outdoors Jun 20–Jul 18 |
| Swiss Chard | Direct sow outdoors Jun 1–Jun 29 |
| Potato | Direct sow outdoors Jun 1–Jun 29 |
| Sweet Corn | Direct sow outdoors Jun 15–Jul 6 |
| Eggplant | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 29–Jul 6 |
| Pumpkin | Direct sow outdoors Jun 15–Jul 6 |
| Winter Squash | Direct sow outdoors Jun 15–Jul 6 |
| Parsley | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 1–Jun 15 Direct sow outdoors Jun 1–Jun 29 |
| Dill | Direct sow outdoors Jun 1–Jun 29 Direct sow outdoors Jun 20–Jul 4 |
| Chives | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 1–Jun 15 |
| Thyme | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 15–Jun 29 |
| Oregano | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 15–Jun 29 |
| Sage | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 15–Jun 29 |
| Rosemary | Start seeds indoors Apr 6–Apr 20 Transplant outdoors Jun 29–Jul 13 |
| Mint | Transplant outdoors Jun 15–Jun 29 |
| Strawberry | Transplant outdoors May 18–Jun 1 |
| Watermelon | Start seeds indoors May 18–Jun 1 Transplant outdoors Jun 29–Jul 6 Direct sow outdoors Jun 22–Jul 6 |
| Cantaloupe | Start seeds indoors May 18–Jun 1 Transplant outdoors Jun 29–Jul 6 Direct sow outdoors Jun 22–Jul 6 |
| Ground Cherry | Start seeds indoors Apr 27–May 11 Transplant outdoors Jun 22–Jun 29 |
| Blueberry | Transplant outdoors May 18–Jun 1 |
| Raspberry | Transplant outdoors May 11–May 25 |
| Marigold | Start seeds indoors May 4–May 18 Transplant outdoors Jun 22–Jun 29 Direct sow outdoors Jun 15–Jun 29 |
| Zinnia | Start seeds indoors May 18–Jun 1 Transplant outdoors Jun 22–Jun 29 Direct sow outdoors Jun 15–Jun 29 |
| Sunflower | Direct sow outdoors Jun 15–Jul 6 |
| Cosmos | Direct sow outdoors Jun 15–Jun 29 |
| Nasturtium | Direct sow outdoors Jun 15–Jun 29 |
| Sweet Pea | Direct sow outdoors May 4–May 25 |
| Snapdragon | Start seeds indoors Apr 20–May 4 Transplant outdoors Jun 1–Jun 15 |
| Pansy | Start seeds indoors Apr 6–Apr 20 Transplant outdoors May 18–Jun 1 |
| Dahlia | Start seeds indoors May 18–Jun 1 Transplant outdoors Jun 22–Jun 29 |
| Calendula | Direct sow outdoors Jun 1–Jun 29 Direct sow outdoors Jun 20–Jul 4 |