Frost dates for 57714Allen, SD
The average last spring frost in Allen is May 13 and the average first fall frost is October 2, giving a typical growing season of about 141 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 13
- Average first fall frost
- Oct 2
- Growing season
- 141 days
Safer after May 27 (1-in-10 risk)
Possible by Sep 18 (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 10 · May 22 · Jun 7 | Sep 8 · Sep 23 · Oct 5 | 122 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 13 · May 27 | Sep 18 · Oct 2 · Oct 15 | 141 days | 100% |
| Hard freeze (28°F) | Apr 18 · May 2 · May 17 | Sep 30 · Oct 12 · Oct 24 | 162 days | 100% |
Planting calendar for Allen
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 12 – Jun 18 |
| Tomatoes | Transplant outdoors | May 29 – Jun 12 |
| Peppers | Start seeds indoors | Apr 12 – May 13 |
| Peppers | Transplant outdoors | Jun 12 – Jul 13 |
| Eggplant | Start seeds indoors | Apr 29 – May 28 |
| Eggplant | Transplant outdoors | Jun 12 – Jul 13 |
| Cucumbers | Sow outdoors | Jun 12 – Jun 22 |
| Summer squash | Sow outdoors | May 29 – Jul 13 |
| Winter squash & pumpkins | Sow outdoors | Jun 12 – Jul 13 |
| Snap beans | Sow outdoors | May 29 – Jul 15 |
| Sweet corn | Sow outdoors | May 29 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 12 – Jul 13 |
| Okra | Sow outdoors | Jun 5 – Jun 28 |
| Peas | Sow outdoors (spring) | Apr 12 – May 28 |
| Potatoes | Plant outdoors (spring) | Apr 12 – Jun 12 |
| Onions | Start seeds indoors (spring) | Mar 1 – Mar 28 |
| Onions | Transplant outdoors (spring) | Apr 29 – May 28 |
| Broccoli | Start seeds indoors (spring) | Mar 25 – Apr 28 |
| Broccoli | Transplant outdoors (spring) | Apr 29 – May 28 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 15 – Apr 12 |
| Cabbage | Transplant outdoors (spring) | Apr 12 – May 13 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 12 – Jun 28 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Apr 5 – May 19 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 12 – Jun 2 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | Apr 29 – May 19 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 13 – Jun 28 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 57714 is matched to the NOAA station Martin, SD, 20 km away, at 3,330 ft elevation (52 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Martin, SD (used) | 3,330 ft | May 13 | Oct 2 |
| Kyle 2 E, SD | 2,958 ft | May 11 | Oct 1 |
| Martin 8 E, SD | 3,036 ft | May 14 | Oct 1 |
| Porcupine 11 N, SD | 2,820 ft | May 17 | Sep 25 |
Frost dates near Allen
- Martin, SD 57551 · last May 13, first Oct 2
- Kyle, SD 57752 · last May 11, first Oct 1
- Batesland, SD 57716 · last May 16, first Sep 27
- Porcupine, SD 57772 · last May 9, first Oct 4
- Wanblee, SD 57577 · last May 9, first Oct 1
- Wounded Knee, SD 57794 · last May 16, first Sep 27
- Tuthill, SD 57574 · last May 11, first Oct 1
- Manderson, SD 57756 · last May 9, first Oct 4
Frequently asked questions
- When is the last frost in Allen, SD?
- For ZIP code 57714, the average last spring frost (32°F) is May 13, based on NOAA 1991-2020 climate normals for the Martin, SD weather station. There is a 1-in-10 chance of a frost after May 27.
- When is the first frost in Allen, SD?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 57714?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 141 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.