Frost dates for 55031Hampton, MN
The average last spring frost in Hampton is May 2 and the average first fall frost is October 5, giving a typical growing season of about 155 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 2
- Average first fall frost
- Oct 5
- Growing season
- 155 days
Safer after May 16 (1-in-10 risk)
Possible by Sep 22 (1-in-10 risk)
Last frost typically in 181 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 29 · May 12 · May 26 | Sep 16 · Sep 28 · Oct 10 | 138 days | 100% |
| Frost / freeze (32°F) | Apr 19 · May 2 · May 16 | Sep 22 · Oct 5 · Oct 19 | 155 days | 100% |
| Hard freeze (28°F) | Apr 8 · Apr 22 · May 7 | Oct 2 · Oct 17 · Oct 31 | 175 days | 100% |
Planting calendar for Hampton
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 1 – Jun 7 |
| Tomatoes | Transplant outdoors | May 18 – Jun 15 |
| Peppers | Start seeds indoors | Apr 1 – May 2 |
| Peppers | Transplant outdoors | Jun 1 – Jul 2 |
| Eggplant | Start seeds indoors | Apr 18 – May 17 |
| Eggplant | Transplant outdoors | Jun 1 – Jul 2 |
| Cucumbers | Sow outdoors | Jun 1 – Jun 25 |
| Summer squash | Sow outdoors | May 18 – Jul 2 |
| Winter squash & pumpkins | Sow outdoors | Jun 1 – Jul 2 |
| Snap beans | Sow outdoors | May 18 – Jul 18 |
| Sweet corn | Sow outdoors | May 18 – Jun 15 |
| Watermelon & cantaloupe | Sow outdoors | Jun 1 – Jul 2 |
| Okra | Sow outdoors | May 25 – Jun 17 |
| Peas | Sow outdoors (spring) | Apr 1 – May 17 |
| Potatoes | Plant outdoors (spring) | Apr 1 – Jun 1 |
| Onions | Start seeds indoors (spring) | Feb 18 – Mar 17 |
| Onions | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (spring) | Mar 14 – Apr 17 |
| Broccoli | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (fall) | Jun 5 – Jun 15 |
| Broccoli | Transplant outdoors (fall) | Jul 5 – Jul 16 |
| Cabbage | Start seeds indoors (spring) | Mar 4 – Apr 1 |
| Cabbage | Transplant outdoors (spring) | Apr 1 – May 2 |
| Cabbage | Start seeds indoors (fall) | May 26 – Jun 25 |
| Cabbage | Transplant outdoors (fall) | Jun 25 – Jul 26 |
| Leaf lettuce | Sow outdoors (spring) | Apr 1 – Jun 17 |
| Leaf lettuce | Sow outdoors (fall) | Jun 25 – Aug 11 |
| Spinach | Sow outdoors (spring) | Mar 25 – May 8 |
| Spinach | Sow outdoors (fall) | Jul 12 – Aug 16 |
| Radishes | Sow outdoors (spring) | Apr 1 – May 22 |
| Radishes | Sow outdoors (fall) | Jun 25 – Aug 26 |
| Kale | Sow outdoors (spring) | Apr 18 – May 8 |
| Kale | Sow outdoors (fall) | Jun 18 – Jul 26 |
| Carrots | Sow outdoors (spring) | May 2 – Jun 17 |
| Carrots | Sow outdoors (fall) | May 26 – Jul 11 |
| Garlic | Plant outdoors (fall) | Sep 25 – Oct 26 |
Where these dates come from
ZIP code 55031 is matched to the NOAA station Rosemount Rsch & Outreach Ctr, MN, 17.4 km away, at 945 ft elevation (66 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Rosemount Rsch & Outreach Ctr, MN (used) | 945 ft | May 2 | Oct 5 |
| Hastings Dam 2, MN | 680 ft | Apr 23 | Oct 19 |
| Farmington 3 Nw, MN | 980 ft | Apr 27 | Oct 10 |
| Red Wing Dam 3, MN | 677 ft | Apr 23 | Oct 14 |
Frost dates near Hampton
- Vermillion, MN 55085 · last May 2, first Oct 5
- Randolph, MN 55065 · last Apr 27, first Oct 10
- Cannon Falls, MN 55009 · last May 9, first Sep 30
- Hastings, MN 55033 · last Apr 23, first Oct 19
- Welch, MN 55089 · last Apr 23, first Oct 14
- Castle Rock, MN 55010 · last Apr 27, first Oct 10
- Farmington, MN 55024 · last Apr 27, first Oct 10
- Dennison, MN 55018 · last May 9, first Sep 30
Frequently asked questions
- When is the last frost in Hampton, MN?
- For ZIP code 55031, the average last spring frost (32°F) is May 2, based on NOAA 1991-2020 climate normals for the Rosemount Rsch & Outreach Ctr, MN weather station. There is a 1-in-10 chance of a frost after May 16.
- When is the first frost in Hampton, MN?
- The average first fall frost (32°F) is October 5. There is a 1-in-10 chance of frost by September 22, so tender plants are at risk from that point on.
- How long is the growing season in 55031?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 155 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.