Frost dates for 57651Reva, SD
The average last spring frost in Reva is May 20 and the average first fall frost is September 19, giving a typical growing season of about 120 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 20
- Average first fall frost
- Sep 19
- Growing season
- 120 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 3 (1-in-10 risk)
Last frost typically in 198 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) | May 18 · May 31 · Jun 17 | Aug 25 · Sep 9 · Sep 23 | 99 days | 100% |
| Frost / freeze (32°F) | May 8 · May 20 · Jun 2 | Sep 3 · Sep 19 · Oct 3 | 120 days | 100% |
| Hard freeze (28°F) | Apr 28 · May 9 · May 23 | Sep 12 · Sep 28 · Oct 11 | 141 days | 100% |
Planting calendar for Reva
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 | Apr 19 – Jun 25 |
| Tomatoes | Transplant outdoors | Jun 5 – May 30 |
| Peppers | Start seeds indoors | Apr 19 – May 20 |
| Peppers | Transplant outdoors | Jun 19 – Jul 20 |
| Eggplant | Start seeds indoors | May 6 – Jun 4 |
| Eggplant | Transplant outdoors | Jun 19 – Jul 20 |
| Cucumbers | Sow outdoors | Jun 19 – Jun 9 |
| Summer squash | Sow outdoors | Jun 5 – Jul 20 |
| Winter squash & pumpkins | Sow outdoors | Jun 19 – Jul 20 |
| Snap beans | Sow outdoors | Jun 5 – Jul 2 |
| Sweet corn | Sow outdoors | Jun 5 – May 30 |
| Watermelon & cantaloupe | Sow outdoors | Jun 19 – Jul 20 |
| Okra | Sow outdoors | Jun 12 – Jul 5 |
| Peas | Sow outdoors (spring) | Apr 19 – Jun 4 |
| Potatoes | Plant outdoors (spring) | Apr 19 – Jun 19 |
| Onions | Start seeds indoors (spring) | Mar 8 – Apr 4 |
| Onions | Transplant outdoors (spring) | May 6 – Jun 4 |
| Broccoli | Start seeds indoors (spring) | Apr 1 – May 5 |
| Broccoli | Transplant outdoors (spring) | May 6 – Jun 4 |
| Broccoli | Start seeds indoors (fall) | May 20 – May 30 |
| Broccoli | Transplant outdoors (fall) | Jun 19 – Jun 30 |
| Cabbage | Start seeds indoors (spring) | Mar 22 – Apr 19 |
| Cabbage | Transplant outdoors (spring) | Apr 19 – May 20 |
| Cabbage | Start seeds indoors (fall) | May 10 – Jun 9 |
| Cabbage | Transplant outdoors (fall) | Jun 9 – Jul 10 |
| Leaf lettuce | Sow outdoors (spring) | Apr 19 – Jul 5 |
| Leaf lettuce | Sow outdoors (fall) | Jun 9 – Jul 26 |
| Spinach | Sow outdoors (spring) | Apr 12 – May 26 |
| Spinach | Sow outdoors (fall) | Jun 26 – Jul 31 |
| Radishes | Sow outdoors (spring) | Apr 19 – Jun 9 |
| Radishes | Sow outdoors (fall) | Jun 9 – Aug 10 |
| Kale | Sow outdoors (spring) | May 6 – May 26 |
| Kale | Sow outdoors (fall) | Jun 2 – Jul 10 |
| Carrots | Sow outdoors (spring) | May 20 – Jul 5 |
| Carrots | Sow outdoors (fall) | May 10 – Jun 25 |
| Garlic | Plant outdoors (fall) | Sep 9 – Oct 10 |
Where these dates come from
ZIP code 57651 is matched to the NOAA station Buffalo 13 Ese, SD, 18.2 km away, at 2,883 ft elevation (113 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Buffalo 13 Ese, SD (used) | 2,883 ft | May 20 | Sep 19 |
| Antelope Rs, SD | 2,820 ft | May 19 | Sep 19 |
| Ralph 1 N, SD | 2,790 ft | May 18 | Sep 23 |
| Redig 11 Ne, SD | 3,070 ft | May 15 | Sep 24 |
Frost dates near Reva
- Prairie City, SD 57649 · last May 10, first Oct 1
- Ralph, SD 57650 · last May 16, first Sep 26
- Buffalo, SD 57720 · last May 10, first Oct 1
- Ludlow, SD 57755 · last May 16, first Sep 26
- Lodgepole, SD 57640 · last May 21, first Sep 21
- Bison, SD 57620 · last May 10, first Oct 1
- Redig, SD 57776 · last May 15, first Sep 24
- Mud Butte, SD 57758 · last May 11, first Sep 28
Frequently asked questions
- When is the last frost in Reva, SD?
- For ZIP code 57651, the average last spring frost (32°F) is May 20, based on NOAA 1991-2020 climate normals for the Buffalo 13 Ese, SD weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Reva, SD?
- The average first fall frost (32°F) is September 19. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.
- How long is the growing season in 57651?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 120 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.