Frost dates for 55325Dassel, MN
The average last spring frost in Dassel is May 6 and the average first fall frost is October 2, giving a typical growing season of about 147 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 6
- Average first fall frost
- Oct 2
- Growing season
- 147 days
Safer after May 22 (1-in-10 risk)
Possible by Sep 20 (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) | May 2 · May 15 · May 31 | Sep 12 · Sep 24 · Oct 5 | 130 days | 100% |
| Frost / freeze (32°F) | Apr 23 · May 6 · May 22 | Sep 20 · Oct 2 · Oct 15 | 147 days | 100% |
| Hard freeze (28°F) | Apr 11 · Apr 27 · May 11 | Sep 27 · Oct 10 · Oct 24 | 167 days | 100% |
Planting calendar for Dassel
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 5 – Jun 11 |
| Tomatoes | Transplant outdoors | May 22 – Jun 12 |
| Peppers | Start seeds indoors | Apr 5 – May 6 |
| Peppers | Transplant outdoors | Jun 5 – Jul 6 |
| Eggplant | Start seeds indoors | Apr 22 – May 21 |
| Eggplant | Transplant outdoors | Jun 5 – Jul 6 |
| Cucumbers | Sow outdoors | Jun 5 – Jun 22 |
| Summer squash | Sow outdoors | May 22 – Jul 6 |
| Winter squash & pumpkins | Sow outdoors | Jun 5 – Jul 6 |
| Snap beans | Sow outdoors | May 22 – Jul 15 |
| Sweet corn | Sow outdoors | May 22 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 5 – Jul 6 |
| Okra | Sow outdoors | May 29 – Jun 21 |
| Peas | Sow outdoors (spring) | Apr 5 – May 21 |
| Potatoes | Plant outdoors (spring) | Apr 5 – Jun 5 |
| Onions | Start seeds indoors (spring) | Feb 22 – Mar 21 |
| Onions | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (spring) | Mar 18 – Apr 21 |
| Broccoli | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 8 – Apr 5 |
| Cabbage | Transplant outdoors (spring) | Apr 5 – May 6 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 5 – Jun 21 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Mar 29 – May 12 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 5 – May 26 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | Apr 22 – May 12 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 6 – Jun 21 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 55325 is matched to the NOAA station Litchfield, MN, 16.3 km away, at 1,120 ft elevation (47 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Litchfield, MN (used) | 1,120 ft | May 6 | Oct 2 |
| Dassel 3Se, MN | 1,065 ft | Apr 30 | Oct 10 |
| Hutchinson 1 N, MN | 1,095 ft | Apr 28 | Oct 8 |
| Kimball 3N, MN | 1,160 ft | May 2 | Oct 5 |
Frost dates near Dassel
- Darwin, MN 55324 · last May 6, first Oct 2
- Cokato, MN 55321 · last Apr 30, first Oct 10
- Litchfield, MN 55355 · last May 6, first Oct 2
- Howard Lake, MN 55575 · last Apr 30, first Oct 9
- South Haven, MN 55382 · last May 2, first Oct 5
- Silver Lake, MN 55381 · last Apr 28, first Oct 8
- Hutchinson, MN 55350 · last Apr 28, first Oct 8
- Annandale, MN 55302 · last Apr 30, first Oct 9
Frequently asked questions
- When is the last frost in Dassel, MN?
- For ZIP code 55325, the average last spring frost (32°F) is May 6, based on NOAA 1991-2020 climate normals for the Litchfield, MN weather station. There is a 1-in-10 chance of a frost after May 22.
- When is the first frost in Dassel, MN?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 20, so tender plants are at risk from that point on.
- How long is the growing season in 55325?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 147 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.