Frost dates for 55067Rock Creek, MN
The average last spring frost in Rock Creek is May 11 and the average first fall frost is October 1, giving a typical growing season of about 141 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 11
- Average first fall frost
- Oct 1
- Growing season
- 141 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 16 (1-in-10 risk)
Last frost typically in 193 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 7 · May 23 · Jun 6 | Sep 7 · Sep 22 · Oct 5 | 120 days | 100% |
| Frost / freeze (32°F) | Apr 27 · May 11 · May 28 | Sep 16 · Oct 1 · Oct 14 | 141 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 30 · May 17 | Sep 26 · Oct 11 · Oct 26 | 161 days | 100% |
Planting calendar for Rock Creek
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 10 – Jun 16 |
| Tomatoes | Transplant outdoors | May 27 – Jun 11 |
| Peppers | Start seeds indoors | Apr 10 – May 11 |
| Peppers | Transplant outdoors | Jun 10 – Jul 11 |
| Eggplant | Start seeds indoors | Apr 27 – May 26 |
| Eggplant | Transplant outdoors | Jun 10 – Jul 11 |
| Cucumbers | Sow outdoors | Jun 10 – Jun 21 |
| Summer squash | Sow outdoors | May 27 – Jul 11 |
| Winter squash & pumpkins | Sow outdoors | Jun 10 – Jul 11 |
| Snap beans | Sow outdoors | May 27 – Jul 14 |
| Sweet corn | Sow outdoors | May 27 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 10 – Jul 11 |
| Okra | Sow outdoors | Jun 3 – Jun 26 |
| Peas | Sow outdoors (spring) | Apr 10 – May 26 |
| Potatoes | Plant outdoors (spring) | Apr 10 – Jun 10 |
| Onions | Start seeds indoors (spring) | Feb 27 – Mar 26 |
| Onions | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (spring) | Mar 23 – Apr 26 |
| Broccoli | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 13 – Apr 10 |
| Cabbage | Transplant outdoors (spring) | Apr 10 – May 11 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 10 – Jun 26 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 3 – May 17 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 10 – May 31 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | Apr 27 – May 17 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 11 – Jun 26 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 55067 is matched to the NOAA station Grantsburg, WI, 21.3 km away, at 990 ft elevation (52 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Grantsburg, WI (used) | 990 ft | May 11 | Oct 1 |
| Hinckley, MN | 1,035 ft | May 16 | Sep 24 |
| Mora, MN | 1,018 ft | May 9 | Sep 30 |
| Cambridge, MN | 965 ft | May 2 | Oct 4 |
Frost dates near Rock Creek
- Rush City, MN 55069 · last May 11, first Oct 1
- Pine City, MN 55063 · last May 11, first Oct 1
- Grasston, MN 55030 · last May 16, first Sep 24
- Henriette, MN 55036 · last May 9, first Sep 30
- Harris, MN 55032 · last May 2, first Oct 4
- Braham, MN 55006 · last May 2, first Oct 4
- Grantsburg, WI 54840 · last May 11, first Oct 1
- Grandy, MN 55029 · last May 2, first Oct 4
Frequently asked questions
- When is the last frost in Rock Creek, MN?
- For ZIP code 55067, the average last spring frost (32°F) is May 11, based on NOAA 1991-2020 climate normals for the Grantsburg, WI weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Rock Creek, MN?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 16, so tender plants are at risk from that point on.
- How long is the growing season in 55067?
- 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.