Planting Calendar for ZIP 57640
Based on your local frost dates - last spring frost around May 30, first fall frost around Sep 11 - here is when to plant 79 common crops near ZIP 57640.
Last spring frost
May 30
First fall frost
Sep 11
Hardiness zone
4b
Vegetables
| Crop | Start seeds indoors | Plant outside | Fall planting by |
|---|---|---|---|
| Tomatoes | Apr 18 | Jun 6 (Transplant out) | - |
| Peppers | Apr 4 | Jun 13 (Transplant out) | - |
| Cucumbers | May 9 | Jun 6 (Transplant out) | Jul 4 |
| Zucchini | May 9 | Jun 6 (Transplant out) | Jul 9 |
| Summer Squash | May 9 | Jun 6 (Transplant out) | Jul 7 |
| Winter Squash | May 9 | Jun 6 (Transplant out) | - |
| Pumpkins | May 9 | Jun 6 (Transplant out) | - |
| Green Beans | - | May 30 (Direct sow) | Jul 4 |
| Sweet Corn | - | Jun 6 (Direct sow) | - |
| Melons | May 9 | Jun 13 (Transplant out) | - |
| Watermelon | May 9 | Jun 13 (Transplant out) | - |
| Okra | - | Jun 13 (Direct sow) | - |
| Eggplant | Apr 4 | Jun 13 (Transplant out) | - |
| Lettuce | May 2 | May 2 (Transplant out) | Jul 9 |
| Spinach | - | Apr 18 (Direct sow) | Jul 14 |
| Kale | Apr 18 | May 9 (Transplant out) | Jul 4 |
| Peas | - | Apr 18 (Direct sow) | Jun 29 |
| Carrots | - | May 9 (Direct sow) | Jun 19 |
| Beets | - | May 2 (Direct sow) | Jul 4 |
| Radishes | - | May 2 (Direct sow) | Jul 31 |
| Broccoli | Apr 18 | May 16 (Transplant out) | Jun 24 |
| Cauliflower | Apr 18 | May 16 (Transplant out) | Jun 19 |
| Cabbage | Apr 18 | May 9 (Transplant out) | Jun 19 |
| Onions | Mar 21 | May 2 (Transplant out) | - |
| Potatoes | - | May 16 (Direct sow) | - |
| Swiss Chard | May 2 | May 16 (Transplant out) | Jul 4 |
| Sweet Potatoes | - | Jun 20 (Direct sow) | - |
| Brussels Sprouts | Apr 18 | May 16 (Transplant out) | May 20 |
| Celery | Mar 21 | Jun 6 (Transplant out) | - |
| Leeks | Mar 21 | May 16 (Transplant out) | Apr 30 |
| Turnips | - | May 16 (Direct sow) | Jul 9 |
| Rutabaga | - | May 30 (Direct sow) | May 25 |
| Parsnips | - | May 16 (Direct sow) | Apr 30 |
| Kohlrabi | May 2 | May 16 (Transplant out) | Jul 4 |
| Collard Greens | Apr 18 | May 16 (Transplant out) | Jun 24 |
| Mustard Greens | - | May 16 (Direct sow) | Jul 14 |
| Arugula | - | May 16 (Direct sow) | Jul 19 |
| Bok Choy | May 2 | May 16 (Transplant out) | Jul 9 |
| Green Onions | - | May 16 (Direct sow) | Jun 29 |
| Tomatillos | Apr 18 | Jun 6 (Transplant out) | - |
| Fennel | May 2 | May 16 (Transplant out) | Jun 9 |
| Popcorn | May 30 | Jun 13 (Transplant out) | - |
| Black-Eyed Peas | May 30 | Jun 13 (Transplant out) | Jun 9 |
| Lima Beans | May 30 | Jun 13 (Transplant out) | - |
| Edamame | May 30 | Jun 13 (Transplant out) | - |
| Peanuts | May 30 | Jun 13 (Transplant out) | - |
| Globe Artichoke | Apr 4 | May 16 (Transplant out) | May 30 |
| Horseradish | May 30 | May 16 (Transplant out) | - |
| Ground Cherries | Apr 18 | Jun 13 (Transplant out) | - |
| Radicchio | Apr 25 | May 16 (Transplant out) | Jun 19 |
| Endive | Apr 25 | May 16 (Transplant out) | May 30 |
| Watercress | May 9 | May 16 (Transplant out) | Jun 29 |
| Sorrel | Apr 18 | May 9 (Transplant out) | Jun 29 |
| Sunchokes | May 30 | May 16 (Transplant out) | - |
| Malabar Spinach | Apr 18 | Jun 13 (Transplant out) | - |
| Amaranth Greens | May 9 | Jun 13 (Transplant out) | Jul 14 |
| Luffa Gourd | Apr 18 | Jun 13 (Transplant out) | - |
| New Zealand Spinach | May 2 | Jun 13 (Transplant out) | - |
| Fava Beans | May 30 | May 2 (Transplant out) | Jun 4 |
| Chayote | May 2 | Jun 13 (Transplant out) | - |
| Corn Salad | May 30 | May 2 (Transplant out) | Jun 29 |
| Bitter Melon | May 2 | Jun 13 (Transplant out) | - |
| Cardoon | Apr 18 | May 30 (Transplant out) | - |
Herbs
| Crop | Start seeds indoors | Plant outside | Fall planting by |
|---|---|---|---|
| Basil | Apr 18 | Jun 6 (Transplant out) | - |
| Cilantro | - | May 16 (Direct sow) | Jul 9 |
| Parsley | Apr 4 | Jun 13 (Transplant out) | Jun 14 |
| Dill | - | Jun 6 (Direct sow) | Jun 29 |
| Lemon Balm | Apr 18 | May 30 (Transplant out) | - |
| Borage | May 30 | May 30 (Transplant out) | Jul 4 |
| Chervil | May 30 | May 9 (Transplant out) | Jul 4 |
| Lemongrass | Apr 4 | Jun 13 (Transplant out) | - |
| Summer Savory | Apr 18 | May 30 (Transplant out) | - |
| Marjoram | Apr 18 | Jun 6 (Transplant out) | - |
| Lovage | Apr 18 | May 30 (Transplant out) | May 30 |
| Anise Hyssop | Apr 4 | May 30 (Transplant out) | - |
| Shiso | Apr 18 | Jun 6 (Transplant out) | - |
| Stevia | Apr 4 | Jun 13 (Transplant out) | - |
| Chamomile | Apr 18 | May 16 (Transplant out) | Jun 24 |
| Tarragon | May 30 | May 30 (Transplant out) | - |
How to read this calendar
Start seeds indoors is when to sow in trays inside so seedlings are ready to transplant. Plant outside is when to transplant seedlings or direct-sow seed, based on frost tolerance. Fall planting by is the latest date to start a fall crop and still harvest before the first fall frost. Tender crops wait until after the last spring frost; hardy crops can go out earlier.
Computed from NOAA 1991–2020 Climate Normals at Lodgepole 5Sw, Sd, 4.7 miles away. Averages for planning, not a forecast. Page updated Aug 4, 2026.