Woonsocket, SD frost dates
Last spring frostMay 9median date
First fall frostSep 28median date
Growing season142 daysfrost-free
Hardiness zone5aZone 5a
How Woonsocket compares
- In 8 years out of 10, the last spring frost in Woonsocket falls between April 27 and May 24, a 27-day window. The first fall frost falls between September 14 and October 10.
- The median last frost is 3 days later than the South Dakota median of May 6.
- Its 142-day growing season is longer than 17% of the 363 South Dakota places with a regular frost season (state median 149 days).
- The last frost is 6 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 168 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 27 |
| 50% (median) | May 9 |
| 10% (safe for tender plants) | May 24 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 14 |
| 50% (median) | September 28 |
| 90% (late) | October 10 |
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 Woonsocket, SD
Woonsocket, SD frost dates — last frost May 9, first frost Sep 28, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 14 to Feb 28Transplant outside: Apr 11 to Apr 25
Start indoors: Feb 28 to Mar 14Transplant outside: May 23 to Jun 6
Start indoors: Feb 28 to Mar 14Transplant outside: May 23 to Jun 6
Start indoors: Mar 14 to Mar 28Transplant outside: May 16 to May 30
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 18 to May 2Sow outdoors: Apr 11 to May 16Plant for fall: Aug 3 to Aug 31
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 11 to Apr 25Plant for fall: Jul 20 to Aug 10
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 25 to May 9Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 18 to May 2Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 25 to May 9Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13Sow outdoors: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Mar 28 to Apr 18Plant for fall: Jul 6 to Jul 27
Sow outdoors: Mar 28 to Apr 18Plant for fall: Aug 3 to Aug 24
Sow outdoors: Apr 4 to May 16Plant for fall: Aug 17 to Sep 7
Start indoors: Apr 11 to Apr 18Transplant outside: May 23 to May 30Sow outdoors: May 16 to May 30Plant for fall: Jul 13 to Jul 27
Start indoors: Apr 11 to Apr 18Sow outdoors: May 16 to May 30Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 11 to Apr 18Sow outdoors: May 16 to May 30
Start indoors: Apr 11 to Apr 18Transplant outside: May 23 to Jun 6
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 6 to Jul 20
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 20 to Aug 3
Sow outdoors: Apr 18 to May 9
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 20 to Aug 3
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 3 to Aug 24
Sow outdoors: May 16 to Jun 6Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 16 to May 30
Transplant outside: May 23 to Jun 13
Plant for fall: Sep 14 to Oct 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Woonsocket, SD
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 14 – Feb 28 | Apr 11 – Apr 25 | — | — |
| Peppers | Feb 28 – Mar 14 | May 23 – Jun 6 | — | — |
| Eggplant | Feb 28 – Mar 14 | May 23 – Jun 6 | — | — |
| Tomatoes | Mar 14 – Mar 28 | May 16 – May 30 | — | — |
| Lettuce | Mar 14 – Mar 28 | Apr 18 – May 2 | Apr 11 – May 16 | Aug 3 – Aug 31 |
| Kale | Mar 14 – Mar 28 | Apr 11 – Apr 25 | Apr 11 – Apr 25 | Jul 20 – Aug 10 |
| Broccoli | Mar 14 – Mar 28 | Apr 25 – May 9 | — | Jun 22 – Jul 13 |
| Cabbage | Mar 14 – Mar 28 | Apr 18 – May 2 | — | Jun 22 – Jul 13 |
| Cauliflower | Mar 14 – Mar 28 | Apr 25 – May 9 | — | Jun 22 – Jul 13 |
| Okra | Mar 28 – Apr 11 | May 30 – Jun 13 | May 30 – Jun 13 | — |
| Basil | Mar 28 – Apr 11 | May 16 – May 30 | — | — |
| Peas | — | — | Mar 28 – Apr 18 | Jul 6 – Jul 27 |
| Spinach | — | — | Mar 28 – Apr 18 | Aug 3 – Aug 24 |
| Radishes | — | — | Apr 4 – May 16 | Aug 17 – Sep 7 |
| Cucumbers | Apr 11 – Apr 18 | May 23 – May 30 | May 16 – May 30 | Jul 13 – Jul 27 |
| Zucchini & Summer Squash | Apr 11 – Apr 18 | — | May 16 – May 30 | Jul 20 – Aug 3 |
| Winter Squash & Pumpkins | Apr 11 – Apr 18 | — | May 16 – May 30 | — |
| Melons & Watermelon | Apr 11 – Apr 18 | May 23 – Jun 6 | — | — |
| Carrots | — | — | Apr 18 – May 16 | Jul 6 – Jul 20 |
| Beets | — | — | Apr 18 – May 16 | Jul 20 – Aug 3 |
| Potatoes | — | — | Apr 18 – May 9 | — |
| Swiss Chard | — | — | Apr 25 – May 23 | Jul 20 – Aug 3 |
| Cilantro | — | — | Apr 25 – May 16 | Aug 3 – Aug 24 |
| Green Beans | — | — | May 16 – Jun 6 | Jul 13 – Jul 27 |
| Sweet Corn | — | — | May 16 – May 30 | — |
| Sweet Potatoes | — | May 23 – Jun 13 | — | — |
| Garlic | — | — | — | Sep 14 – Oct 19 |
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 Forestburg 4 Nne, SD weather station, 13 km away (elevation 1,276 ft (389 m)).
Frost dates near Woonsocket
- Lane May 2 · Oct 8
- Alpena May 2 · Oct 8
- Artesian May 9 · Sep 28
- Letcher Apr 27 · Oct 11
- Virgil May 6 · Oct 2
- Huron May 6 · Oct 2
- Wessington Springs May 2 · Oct 8
- Fedora May 5 · Oct 2
- Mount Vernon Apr 27 · Oct 11
- Cavour May 6 · Oct 2
Frequently asked questions
When is the last frost in Woonsocket, SD?
The median last spring frost in Woonsocket, SD is May 9. There is still about a 10% chance of frost after May 24, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Woonsocket, SD?
The median first fall frost is September 28, with about a 10% chance of frost before September 14.
How long is the growing season in Woonsocket, SD?
About 142 days between the median last spring frost and first fall frost.
What planting zone is Woonsocket, SD?
Woonsocket, SD is in USDA hardiness zone 5a.