Lower Brule, SD frost dates
Last spring frostMay 6median date
First fall frostOct 5median date
Growing season152 daysfrost-free
Hardiness zone4bZone 4b
How Lower Brule compares
- In 8 years out of 10, the last spring frost in Lower Brule falls between April 25 and May 20, a 25-day window. The first fall frost falls between September 23 and October 18.
- The median last frost is the same as the South Dakota median of May 6.
- Its 152-day growing season is longer than 60% 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 171 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 25 |
| 50% (median) | May 6 |
| 10% (safe for tender plants) | May 20 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 23 |
| 50% (median) | October 5 |
| 90% (late) | October 18 |
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 Lower Brule, SD
Lower Brule, SD frost dates — last frost May 6, first frost Oct 5, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 11 to Feb 25Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Sow outdoors: Apr 8 to May 13Plant for fall: Aug 10 to Sep 7
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 8 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Jul 27 to Aug 17
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10Sow outdoors: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: May 13 to May 27
Sow outdoors: Mar 25 to Apr 15Plant for fall: Jul 13 to Aug 3
Sow outdoors: Mar 25 to Apr 15Plant for fall: Aug 10 to Aug 31
Sow outdoors: Apr 1 to May 13Plant for fall: Aug 24 to Sep 14
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to May 27Sow outdoors: May 13 to May 27Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27Plant for fall: Jul 27 to Aug 10
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to Jun 3
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 13 to Jul 27
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 15 to May 6
Sow outdoors: Apr 22 to May 20Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 10 to Aug 31
Sow outdoors: May 13 to Jun 3Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 13 to May 27
Transplant outside: May 20 to Jun 10
Plant for fall: Sep 21 to Oct 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Lower Brule, SD
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 11 – Feb 25 | Apr 8 – Apr 22 | — | — |
| Peppers | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Eggplant | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Tomatoes | Mar 11 – Mar 25 | May 13 – May 27 | — | — |
| Lettuce | Mar 11 – Mar 25 | Apr 15 – Apr 29 | Apr 8 – May 13 | Aug 10 – Sep 7 |
| Kale | Mar 11 – Mar 25 | Apr 8 – Apr 22 | Apr 8 – Apr 22 | Jul 27 – Aug 17 |
| Broccoli | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 29 – Jul 20 |
| Cabbage | Mar 11 – Mar 25 | Apr 15 – Apr 29 | — | Jun 29 – Jul 20 |
| Cauliflower | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 29 – Jul 20 |
| Okra | Mar 25 – Apr 8 | May 27 – Jun 10 | May 27 – Jun 10 | — |
| Basil | Mar 25 – Apr 8 | May 13 – May 27 | — | — |
| Peas | — | — | Mar 25 – Apr 15 | Jul 13 – Aug 3 |
| Spinach | — | — | Mar 25 – Apr 15 | Aug 10 – Aug 31 |
| Radishes | — | — | Apr 1 – May 13 | Aug 24 – Sep 14 |
| Cucumbers | Apr 8 – Apr 15 | May 20 – May 27 | May 13 – May 27 | Jul 20 – Aug 3 |
| Zucchini & Summer Squash | Apr 8 – Apr 15 | — | May 13 – May 27 | Jul 27 – Aug 10 |
| Winter Squash & Pumpkins | Apr 8 – Apr 15 | — | May 13 – May 27 | — |
| Melons & Watermelon | Apr 8 – Apr 15 | May 20 – Jun 3 | — | — |
| Carrots | — | — | Apr 15 – May 13 | Jul 13 – Jul 27 |
| Beets | — | — | Apr 15 – May 13 | Jul 27 – Aug 10 |
| Potatoes | — | — | Apr 15 – May 6 | — |
| Swiss Chard | — | — | Apr 22 – May 20 | Jul 27 – Aug 10 |
| Cilantro | — | — | Apr 22 – May 13 | Aug 10 – Aug 31 |
| Green Beans | — | — | May 13 – Jun 3 | Jul 20 – Aug 3 |
| Sweet Corn | — | — | May 13 – May 27 | — |
| Sweet Potatoes | — | May 20 – Jun 10 | — | — |
| 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 Lake Sharpe Prj, SD weather station, 13 km away (elevation 1,460 ft (445 m)).
Frost dates near Lower Brule
- Fort Thompson May 6 · Oct 5
- Stephan May 10 · Sep 29
- Reliance May 12 · Sep 28
- Kennebec May 12 · Sep 28
- Oacoma May 1 · Oct 7
- Chamberlain May 1 · Oct 7
- Presho May 12 · Sep 29
- Gann Valley May 6 · Oct 1
- Holabird May 12 · Oct 1
- Harrold May 17 · Sep 24
Frequently asked questions
When is the last frost in Lower Brule, SD?
The median last spring frost in Lower Brule, SD is May 6. There is still about a 10% chance of frost after May 20, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Lower Brule, SD?
The median first fall frost is October 5, with about a 10% chance of frost before September 23.
How long is the growing season in Lower Brule, SD?
About 152 days between the median last spring frost and first fall frost.
What planting zone is Lower Brule, SD?
Lower Brule, SD is in USDA hardiness zone 4b.