Wilmot, SD frost dates
Last spring frostMay 5median date
First fall frostOct 1median date
Growing season149 daysfrost-free
Hardiness zone4bZone 4b
How Wilmot compares
- In 8 years out of 10, the last spring frost in Wilmot falls between April 24 and May 18, a 24-day window. The first fall frost falls between September 21 and October 13.
- The median last frost is 1 day earlier than the South Dakota median of May 6.
- Its 149-day growing season is longer than 48% of the 363 South Dakota places with a regular frost season (state median 149 days).
- The last frost is typical for zone 4b, where the median is May 8.
- The weather station records an average of 172 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 24 |
| 50% (median) | May 5 |
| 10% (safe for tender plants) | May 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 21 |
| 50% (median) | October 1 |
| 90% (late) | October 13 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Wilmot, SD
Wilmot, SD frost dates — last frost May 5, first frost Oct 1, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 10 to Feb 24Transplant outside: Apr 7 to Apr 21
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Mar 10 to Mar 24Transplant outside: May 12 to May 26
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 7 to May 12Plant for fall: Aug 6 to Sep 3
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 7 to Apr 21Sow outdoors: Apr 7 to Apr 21Plant for fall: Jul 23 to Aug 13
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 24 to Apr 7Transplant outside: May 26 to Jun 9Sow outdoors: May 26 to Jun 9
Start indoors: Mar 24 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Mar 24 to Apr 14Plant for fall: Jul 9 to Jul 30
Sow outdoors: Mar 24 to Apr 14Plant for fall: Aug 6 to Aug 27
Sow outdoors: Mar 31 to May 12Plant for fall: Aug 20 to Sep 10
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to May 26Sow outdoors: May 12 to May 26Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26Plant for fall: Jul 23 to Aug 6
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to Jun 2
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 14 to May 5
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 21 to May 12Plant for fall: Aug 6 to Aug 27
Sow outdoors: May 12 to Jun 2Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 12 to May 26
Transplant outside: May 19 to Jun 9
Plant for fall: Sep 17 to Oct 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wilmot, SD
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 10 – Feb 24 | Apr 7 – Apr 21 | — | — |
| Peppers | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Eggplant | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Tomatoes | Mar 10 – Mar 24 | May 12 – May 26 | — | — |
| Lettuce | Mar 10 – Mar 24 | Apr 14 – Apr 28 | Apr 7 – May 12 | Aug 6 – Sep 3 |
| Kale | Mar 10 – Mar 24 | Apr 7 – Apr 21 | Apr 7 – Apr 21 | Jul 23 – Aug 13 |
| Broccoli | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 25 – Jul 16 |
| Cabbage | Mar 10 – Mar 24 | Apr 14 – Apr 28 | — | Jun 25 – Jul 16 |
| Cauliflower | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 25 – Jul 16 |
| Okra | Mar 24 – Apr 7 | May 26 – Jun 9 | May 26 – Jun 9 | — |
| Basil | Mar 24 – Apr 7 | May 12 – May 26 | — | — |
| Peas | — | — | Mar 24 – Apr 14 | Jul 9 – Jul 30 |
| Spinach | — | — | Mar 24 – Apr 14 | Aug 6 – Aug 27 |
| Radishes | — | — | Mar 31 – May 12 | Aug 20 – Sep 10 |
| Cucumbers | Apr 7 – Apr 14 | May 19 – May 26 | May 12 – May 26 | Jul 16 – Jul 30 |
| Zucchini & Summer Squash | Apr 7 – Apr 14 | — | May 12 – May 26 | Jul 23 – Aug 6 |
| Winter Squash & Pumpkins | Apr 7 – Apr 14 | — | May 12 – May 26 | — |
| Melons & Watermelon | Apr 7 – Apr 14 | May 19 – Jun 2 | — | — |
| Carrots | — | — | Apr 14 – May 12 | Jul 9 – Jul 23 |
| Beets | — | — | Apr 14 – May 12 | Jul 23 – Aug 6 |
| Potatoes | — | — | Apr 14 – May 5 | — |
| Swiss Chard | — | — | Apr 21 – May 19 | Jul 23 – Aug 6 |
| Cilantro | — | — | Apr 21 – May 12 | Aug 6 – Aug 27 |
| Green Beans | — | — | May 12 – Jun 2 | Jul 16 – Jul 30 |
| Sweet Corn | — | — | May 12 – May 26 | — |
| Sweet Potatoes | — | May 19 – Jun 9 | — | — |
| Garlic | — | — | — | Sep 17 – Oct 22 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Wilmot, SD weather station, about 1 km away (elevation 1,201 ft (366 m)).
Frost dates near Wilmot
- Corona May 2 · Oct 4
- Summit May 14 · Sep 28
- Marvin May 14 · Sep 28
- Peever May 9 · Sep 28
- Twin Brooks May 2 · Oct 4
- Big Stone City May 5 · Oct 2
- Milbank May 5 · Oct 2
- Ortley May 14 · Sep 28
- Sisseton May 4 · Oct 3
- Waubay May 1 · Oct 12
Frequently asked questions
When is the last frost in Wilmot, SD?
The median last spring frost in Wilmot, SD is May 5. There is still about a 10% chance of frost after May 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wilmot, SD?
The median first fall frost is October 1, with about a 10% chance of frost before September 21.
How long is the growing season in Wilmot, SD?
About 149 days between the median last spring frost and first fall frost.
What planting zone is Wilmot, SD?
Wilmot, SD is in USDA hardiness zone 4b.