Huron, SD planting zone & frost dates
Huron is in USDA hardiness zone 4b. The last spring frost usually comes around May 6 and the first fall frost around October 2, for a growing season of about 146 days.
Planting calendar for Huron
Dates are counted from the average last spring frost (May 6) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 11 – Mar 25 Transplant outdoors: May 13 – May 20 |
| Peppers | Start seeds indoors: Feb 25 – Mar 11 Transplant outdoors: May 20 – May 27 |
| Eggplant | Start seeds indoors: Feb 25 – Mar 11 Transplant outdoors: May 20 – May 27 |
| Broccoli | Start seeds indoors: Feb 25 – Mar 11 Transplant outdoors: Apr 8 – Apr 22 |
| Cabbage | Start seeds indoors: Feb 25 – Mar 11 Transplant outdoors: Apr 8 – Apr 22 |
| Onions (sets) | Plant outdoors: Apr 8 – Apr 22 |
| Peas | Sow outdoors: Mar 25 – Apr 8 |
| Spinach | Sow outdoors: Mar 25 – Apr 8 |
| Lettuce | Sow outdoors: Apr 8 – Apr 22 |
| Carrots | Sow outdoors: Apr 8 – Apr 22 |
| Potatoes | Plant outdoors: Apr 8 – Apr 22 |
| Beans | Sow outdoors: May 13 – May 20 |
| Sweet corn | Sow outdoors: May 13 – May 20 |
| Cucumbers | Sow outdoors: May 13 – May 20 |
| Squash & zucchini | Sow outdoors: May 13 – May 20 |
| Basil | Start seeds indoors: Mar 25 – Apr 8 Transplant outdoors: May 13 – May 20 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 7 (8 weeks before the average first fall frost on Oct 2).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 23 | May 6 | May 20 |
| First 32°F frost in fall is before | Oct 14 | Oct 2 | Sep 19 |
How to read it: in spring there is a 10% chance of a frost after May 20, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 19. A hard freeze (28°F) usually ends around April 27.
Hardiness zone by ZIP code in Huron
- 57350 zone 4b
- 57399 zone 4b
Nearby cities
- Mitchell zone 5a, last frost May 2
- Aberdeen zone 4a, last frost May 8
- Watertown zone 4b, last frost May 7
- Brookings zone 4b, last frost May 6
- Sioux Falls zone 5a, last frost May 1
- Yankton zone 5a, last frost Apr 27
- Vermillion zone 5a, last frost May 3
- Rapid City zone 5b, last frost May 3
Questions
What growing zone is Huron, SD?
Huron is in USDA Plant Hardiness Zone 4b (average extreme winter low -25°F to -20°F), according to the USDA 2023 map.
When is the last frost in Huron?
The average last spring frost (32°F) in Huron is May 6. There is still a 10% chance of frost until May 20.
When can I plant tomatoes in Huron?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 13 – May 20. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Huron Rgnl Ap, SD (USW00014936), 3.9 km (2.4 mi) from the city center, elevation 390 m, based on 28 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.