When to plant mizuna in South Dakota
South Dakota spans USDA zones 4a–5b, so the right time to plant mizuna shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 29 in Sioux Falls to April 14 in Spearfish — below are local dates for 13 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Sioux Falls | 5a | April 26 | October 13 | March 29 – May 10 |
| Rapid City | 5b | May 3 | October 8 | April 5 – May 17 |
| Aberdeen | 4a | May 8 | September 29 | April 10 – May 22 |
| Brookings | 4b | May 6 | October 1 | April 8 – May 20 |
| Watertown | 4b | May 7 | September 30 | April 9 – May 21 |
| Mitchell | 5a | May 2 | October 6 | April 4 – May 16 |
| Yankton | 5a | April 27 | October 11 | March 30 – May 11 |
| Huron | 4b | May 6 | October 2 | April 8 – May 20 |
Mizuna in South Dakota: FAQ
When can I plant mizuna in South Dakota?
Across South Dakota, the time to direct-sow mizuna spans roughly March 29 in Sioux Falls to April 14 in Spearfish, each following that city's local frost dates.
Does the mizuna planting date vary across South Dakota?
Yes. South Dakota publishes 13 cities with their own frost dates, so the right mizuna planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does mizuna take to grow in South Dakota?
Mizuna takes about 40–50 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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