Wentworth, SD frost dates
Last spring frostMay 2median date
First fall frostOct 5median date
Growing season156 daysfrost-free
Hardiness zone4bZone 4b
How Wentworth compares
- In 8 years out of 10, the last spring frost in Wentworth falls between April 18 and May 14, a 26-day window. The first fall frost falls between September 24 and October 19.
- The median last frost is 4 days earlier than the South Dakota median of May 6.
- Its 156-day growing season is longer than 75% of the 363 South Dakota places with a regular frost season (state median 149 days).
- The last frost is 6 days earlier than the zone 4b median of May 8. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4b chart.
- The weather station records an average of 162 nights a year at or below 32°F.
- Compared with Sioux Falls, SD, 47 km away, the last frost here is 6 days later than there and the growing season is 14 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 18 |
| 50% (median) | May 2 |
| 10% (safe for tender plants) | May 14 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 24 |
| 50% (median) | October 5 |
| 90% (late) | October 19 |
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 Wentworth, SD
Wentworth, SD frost dates — last frost May 2, first frost Oct 5, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 7 to Feb 21Transplant outside: Apr 4 to Apr 18
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 4 to May 9Plant for fall: Aug 10 to Sep 7
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 4 to Apr 18Sow outdoors: Apr 4 to Apr 18Plant for fall: Jul 27 to Aug 17
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6Sow outdoors: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Mar 21 to Apr 11Plant for fall: Jul 13 to Aug 3
Sow outdoors: Mar 21 to Apr 11Plant for fall: Aug 10 to Aug 31
Sow outdoors: Mar 28 to May 9Plant for fall: Aug 24 to Sep 14
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23Plant for fall: Jul 27 to Aug 10
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 13 to Jul 27
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 11 to May 2
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 10 to Aug 31
Sow outdoors: May 9 to May 30Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 9 to May 23
Transplant outside: May 16 to Jun 6
Plant for fall: Sep 21 to Oct 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wentworth, SD
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 7 – Feb 21 | Apr 4 – Apr 18 | — | — |
| Peppers | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Eggplant | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Tomatoes | Mar 7 – Mar 21 | May 9 – May 23 | — | — |
| Lettuce | Mar 7 – Mar 21 | Apr 11 – Apr 25 | Apr 4 – May 9 | Aug 10 – Sep 7 |
| Kale | Mar 7 – Mar 21 | Apr 4 – Apr 18 | Apr 4 – Apr 18 | Jul 27 – Aug 17 |
| Broccoli | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jun 29 – Jul 20 |
| Cabbage | Mar 7 – Mar 21 | Apr 11 – Apr 25 | — | Jun 29 – Jul 20 |
| Cauliflower | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jun 29 – Jul 20 |
| Okra | Mar 21 – Apr 4 | May 23 – Jun 6 | May 23 – Jun 6 | — |
| Basil | Mar 21 – Apr 4 | May 9 – May 23 | — | — |
| Peas | — | — | Mar 21 – Apr 11 | Jul 13 – Aug 3 |
| Spinach | — | — | Mar 21 – Apr 11 | Aug 10 – Aug 31 |
| Radishes | — | — | Mar 28 – May 9 | Aug 24 – Sep 14 |
| Cucumbers | Apr 4 – Apr 11 | May 16 – May 23 | May 9 – May 23 | Jul 20 – Aug 3 |
| Zucchini & Summer Squash | Apr 4 – Apr 11 | — | May 9 – May 23 | Jul 27 – Aug 10 |
| Winter Squash & Pumpkins | Apr 4 – Apr 11 | — | May 9 – May 23 | — |
| Melons & Watermelon | Apr 4 – Apr 11 | May 16 – May 30 | — | — |
| Carrots | — | — | Apr 11 – May 9 | Jul 13 – Jul 27 |
| Beets | — | — | Apr 11 – May 9 | Jul 27 – Aug 10 |
| Potatoes | — | — | Apr 11 – May 2 | — |
| Swiss Chard | — | — | Apr 18 – May 16 | Jul 27 – Aug 10 |
| Cilantro | — | — | Apr 18 – May 9 | Aug 10 – Aug 31 |
| Green Beans | — | — | May 9 – May 30 | Jul 20 – Aug 3 |
| Sweet Corn | — | — | May 9 – May 23 | — |
| Sweet Potatoes | — | May 16 – Jun 6 | — | — |
| Garlic | — | — | — | Sep 21 – Oct 26 |
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 Wentworth 2.5 Wnw, SD weather station, 4 km away (elevation 1,722 ft (525 m)).
Frost dates near Wentworth
- Rutland May 2 · Oct 5
- Chester May 2 · Oct 5
- Colman May 2 · Oct 5
- Madison May 5 · Sep 30
- Nunda May 2 · Oct 5
- Colton May 3 · Oct 4
- Egan May 5 · Oct 1
- Dell Rapids May 1 · Oct 4
- Ramona May 5 · Sep 30
- Trent May 1 · Oct 4
Frequently asked questions
When is the last frost in Wentworth, SD?
The median last spring frost in Wentworth, SD is May 2. There is still about a 10% chance of frost after May 14, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wentworth, SD?
The median first fall frost is October 5, with about a 10% chance of frost before September 24.
How long is the growing season in Wentworth, SD?
About 156 days between the median last spring frost and first fall frost.
What planting zone is Wentworth, SD?
Wentworth, SD is in USDA hardiness zone 4b.