Frost dates for 57325Chamberlain, SD
The average last spring frost in Chamberlain is May 1 and the average first fall frost is October 7, giving a typical growing season of about 158 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 1
- Average first fall frost
- Oct 7
- Growing season
- 158 days
Safer after May 14 (1-in-10 risk)
Possible by Sep 23 (1-in-10 risk)
Last frost typically in 179 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 30 · May 10 · May 24 | Sep 17 · Sep 28 · Oct 12 | 139 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 1 · May 14 | Sep 23 · Oct 7 · Oct 20 | 158 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 21 · May 4 | Oct 1 · Oct 16 · Oct 30 | 177 days | 100% |
Planting calendar for Chamberlain
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 31 – Jun 6 |
| Tomatoes | Transplant outdoors | May 17 – Jun 17 |
| Peppers | Start seeds indoors | Mar 31 – May 1 |
| Peppers | Transplant outdoors | May 31 – Jul 1 |
| Eggplant | Start seeds indoors | Apr 17 – May 16 |
| Eggplant | Transplant outdoors | May 31 – Jul 1 |
| Cucumbers | Sow outdoors | May 31 – Jun 27 |
| Summer squash | Sow outdoors | May 17 – Jul 1 |
| Winter squash & pumpkins | Sow outdoors | May 31 – Jul 1 |
| Snap beans | Sow outdoors | May 17 – Jul 20 |
| Sweet corn | Sow outdoors | May 17 – Jun 17 |
| Watermelon & cantaloupe | Sow outdoors | May 31 – Jul 1 |
| Okra | Sow outdoors | May 24 – Jun 16 |
| Peas | Sow outdoors (spring) | Mar 31 – May 16 |
| Potatoes | Plant outdoors (spring) | Mar 31 – May 31 |
| Onions | Start seeds indoors (spring) | Feb 17 – Mar 16 |
| Onions | Transplant outdoors (spring) | Apr 17 – May 16 |
| Broccoli | Start seeds indoors (spring) | Mar 13 – Apr 16 |
| Broccoli | Transplant outdoors (spring) | Apr 17 – May 16 |
| Broccoli | Start seeds indoors (fall) | Jun 7 – Jun 17 |
| Broccoli | Transplant outdoors (fall) | Jul 7 – Jul 18 |
| Cabbage | Start seeds indoors (spring) | Mar 3 – Mar 31 |
| Cabbage | Transplant outdoors (spring) | Mar 31 – May 1 |
| Cabbage | Start seeds indoors (fall) | May 28 – Jun 27 |
| Cabbage | Transplant outdoors (fall) | Jun 27 – Jul 28 |
| Leaf lettuce | Sow outdoors (spring) | Mar 31 – Jun 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 27 – Aug 13 |
| Spinach | Sow outdoors (spring) | Mar 24 – May 7 |
| Spinach | Sow outdoors (fall) | Jul 14 – Aug 18 |
| Radishes | Sow outdoors (spring) | Mar 31 – May 21 |
| Radishes | Sow outdoors (fall) | Jun 27 – Aug 28 |
| Kale | Sow outdoors (spring) | Apr 17 – May 7 |
| Kale | Sow outdoors (fall) | Jun 20 – Jul 28 |
| Carrots | Sow outdoors (spring) | May 1 – Jun 16 |
| Carrots | Sow outdoors (fall) | May 28 – Jul 13 |
| Garlic | Plant outdoors (fall) | Sep 27 – Oct 28 |
Where these dates come from
ZIP code 57325 is matched to the NOAA station Chamberlain Muni Ap, SD, 3.2 km away, at 1,703 ft elevation (125 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chamberlain Muni Ap, SD (used) | 1,703 ft | May 1 | Oct 7 |
| Chamberlain 5 S, SD | 1,704 ft | May 3 | Oct 7 |
| Lake Sharpe Prj, SD | 1,461 ft | May 6 | Oct 5 |
| Gann Valley 4Nw, SD | 1,720 ft | May 6 | Oct 1 |
Frost dates near Chamberlain
- Chamberlain, SD 57326 · last May 1, first Oct 7
- Oacoma, SD 57365 · last May 1, first Oct 7
- Pukwana, SD 57370 · last May 1, first Oct 7
- Reliance, SD 57569 · last May 12, first Sep 28
- Kimball, SD 57355 · last May 3, first Oct 5
- Fort Thompson, SD 57339 · last May 6, first Oct 5
- Hamill, SD 57534 · last May 3, first Oct 7
- Gann Valley, SD 57341 · last May 6, first Oct 1
Frequently asked questions
- When is the last frost in Chamberlain, SD?
- For ZIP code 57325, the average last spring frost (32°F) is May 1, based on NOAA 1991-2020 climate normals for the Chamberlain Muni Ap, SD weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Chamberlain, SD?
- The average first fall frost (32°F) is October 7. There is a 1-in-10 chance of frost by September 23, so tender plants are at risk from that point on.
- How long is the growing season in 57325?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 158 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.