Frost dates for 56225Clinton, MN
The average last spring frost in Clinton is May 1 and the average first fall frost is October 8, giving a typical growing season of about 159 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 1
- Average first fall frost
- Oct 8
- Growing season
- 159 days
Safer after May 14 (1-in-10 risk)
Possible by Sep 26 (1-in-10 risk)
Last frost typically in 186 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 27 · May 10 · May 23 | Sep 18 · Sep 30 · Oct 11 | 142 days | 100% |
| Frost / freeze (32°F) | Apr 17 · May 1 · May 14 | Sep 26 · Oct 8 · Oct 22 | 159 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 21 · May 5 | Oct 3 · Oct 19 · Nov 1 | 178 days | 100% |
Planting calendar for Clinton
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 18 |
| 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 28 |
| Summer squash | Sow outdoors | May 17 – Jul 1 |
| Winter squash & pumpkins | Sow outdoors | May 31 – Jul 1 |
| Snap beans | Sow outdoors | May 17 – Jul 21 |
| Sweet corn | Sow outdoors | May 17 – Jun 18 |
| 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 8 – Jun 18 |
| Broccoli | Transplant outdoors (fall) | Jul 8 – Jul 19 |
| Cabbage | Start seeds indoors (spring) | Mar 3 – Mar 31 |
| Cabbage | Transplant outdoors (spring) | Mar 31 – May 1 |
| Cabbage | Start seeds indoors (fall) | May 29 – Jun 28 |
| Cabbage | Transplant outdoors (fall) | Jun 28 – Jul 29 |
| Leaf lettuce | Sow outdoors (spring) | Mar 31 – Jun 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 28 – Aug 14 |
| Spinach | Sow outdoors (spring) | Mar 24 – May 7 |
| Spinach | Sow outdoors (fall) | Jul 15 – Aug 19 |
| Radishes | Sow outdoors (spring) | Mar 31 – May 21 |
| Radishes | Sow outdoors (fall) | Jun 28 – Aug 29 |
| Kale | Sow outdoors (spring) | Apr 17 – May 7 |
| Kale | Sow outdoors (fall) | Jun 21 – Jul 29 |
| Carrots | Sow outdoors (spring) | May 1 – Jun 16 |
| Carrots | Sow outdoors (fall) | May 29 – Jul 14 |
| Garlic | Plant outdoors (fall) | Sep 28 – Oct 29 |
Where these dates come from
ZIP code 56225 is matched to the NOAA station Artichoke Lake 1 E, MN, 24.2 km away, at 1,098 ft elevation (60 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Artichoke Lake 1 E, MN (used) | 1,098 ft | May 1 | Oct 8 |
| Milbank 4 Nw, SD | 1,145 ft | May 2 | Oct 4 |
| Milbank, SD | 1,142 ft | May 5 | Oct 2 |
| Wilmot, SD | 1,201 ft | May 5 | Oct 1 |
Frost dates near Clinton
- Graceville, MN 56240 · last May 1, first Oct 8
- Ortonville, MN 56278 · last May 1, first Oct 8
- Barry, MN 56210 · last May 9, first Sep 28
- Chokio, MN 56221 · last May 1, first Oct 8
- Corona, SD 57227 · last May 5, first Oct 1
- Big Stone City, SD 57216 · last May 5, first Oct 2
- Odessa, MN 56276 · last May 1, first Oct 8
- Dumont, MN 56236 · last May 1, first Oct 9
Frequently asked questions
- When is the last frost in Clinton, MN?
- For ZIP code 56225, the average last spring frost (32°F) is May 1, based on NOAA 1991-2020 climate normals for the Artichoke Lake 1 E, MN weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Clinton, MN?
- The average first fall frost (32°F) is October 8. There is a 1-in-10 chance of frost by September 26, so tender plants are at risk from that point on.
- How long is the growing season in 56225?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 159 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.