Frost dates for 55746Hibbing, MN
The average last spring frost in Hibbing is June 5 and the average first fall frost is September 8, giving a typical growing season of about 93 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 5
- Average first fall frost
- Sep 8
- Growing season
- 93 days
Safer after Jun 25 (1-in-10 risk)
Possible by Aug 23 (1-in-10 risk)
Last frost typically in 214 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) | — | — | 61 days | 100% |
| Frost / freeze (32°F) | May 22 · Jun 5 · Jun 25 | Aug 23 · Sep 8 · Sep 23 | 93 days | 100% |
| Hard freeze (28°F) | May 6 · May 23 · Jun 7 | Sep 4 · Sep 21 · Oct 5 | 120 days | 100% |
Planting calendar for Hibbing
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 | May 5 – Jul 11 |
| Tomatoes | Transplant outdoors | Jun 21 – May 19 |
| Peppers | Start seeds indoors | May 5 – Jun 5 |
| Peppers | Transplant outdoors | Jul 5 – Aug 5 |
| Eggplant | Start seeds indoors | May 22 – Jun 20 |
| Eggplant | Transplant outdoors | Jul 5 – Aug 5 |
| Cucumbers | Sow outdoors | Jul 5 – May 29 |
| Summer squash | Sow outdoors | Jun 21 – Aug 5 |
| Winter squash & pumpkins | Sow outdoors | Jul 5 – Aug 5 |
| Snap beans | Sow outdoors | Jun 21 – Jun 21 |
| Sweet corn | Sow outdoors | Jun 21 – May 19 |
| Watermelon & cantaloupe | Sow outdoors | Jul 5 – Aug 5 |
| Okra | Sow outdoors | Jun 28 – Jul 21 |
| Peas | Sow outdoors (spring) | May 5 – Jun 20 |
| Potatoes | Plant outdoors (spring) | May 5 – Jul 5 |
| Onions | Start seeds indoors (spring) | Mar 24 – Apr 20 |
| Onions | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (spring) | Apr 17 – May 21 |
| Broccoli | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (fall) | May 9 – May 19 |
| Broccoli | Transplant outdoors (fall) | Jun 8 – Jun 19 |
| Cabbage | Start seeds indoors (spring) | Apr 7 – May 5 |
| Cabbage | Transplant outdoors (spring) | May 5 – Jun 5 |
| Cabbage | Start seeds indoors (fall) | Apr 29 – May 29 |
| Cabbage | Transplant outdoors (fall) | May 29 – Jun 29 |
| Leaf lettuce | Sow outdoors (spring) | May 5 – Jul 21 |
| Leaf lettuce | Sow outdoors (fall) | May 29 – Jul 15 |
| Spinach | Sow outdoors (spring) | Apr 28 – Jun 11 |
| Spinach | Sow outdoors (fall) | Jun 15 – Jul 20 |
| Radishes | Sow outdoors (spring) | May 5 – Jun 25 |
| Radishes | Sow outdoors (fall) | May 29 – Jul 30 |
| Kale | Sow outdoors (spring) | May 22 – Jun 11 |
| Kale | Sow outdoors (fall) | May 22 – Jun 29 |
| Carrots | Sow outdoors (spring) | Jun 5 – Jul 21 |
| Carrots | Sow outdoors (fall) | Apr 29 – Jun 14 |
| Garlic | Plant outdoors (fall) | Aug 29 – Sep 29 |
Where these dates come from
ZIP code 55746 is matched to the NOAA station Hibbing Chisholm Hibbing Ap, MN, 8 km away, at 1,352 ft elevation (154 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hibbing Chisholm Hibbing Ap, MN (used) | 1,352 ft | Jun 5 | Sep 8 |
| Eveleth Wwtp, MN | 1,445 ft | May 12 | Oct 1 |
| Cotton, MN | 1,323 ft | May 27 | Sep 20 |
| Grand Rpds Forest Lab, MN | 1,310 ft | May 17 | Sep 24 |
Frost dates near Hibbing
- Hibbing, MN 55747 · last Jun 5, first Sep 8
- Keewatin, MN 55753 · last Jun 5, first Sep 8
- Chisholm, MN 55719 · last Jun 5, first Sep 8
- Buhl, MN 55713 · last Jun 5, first Sep 8
- Kinney, MN 55758 · last May 12, first Oct 1
- Nashwauk, MN 55769 · last Jun 5, first Sep 8
- Pengilly, MN 55775 · last May 17, first Sep 24
- Iron, MN 55751 · last May 12, first Oct 1
Frequently asked questions
- When is the last frost in Hibbing, MN?
- For ZIP code 55746, the average last spring frost (32°F) is June 5, based on NOAA 1991-2020 climate normals for the Hibbing Chisholm Hibbing Ap, MN weather station. There is a 1-in-10 chance of a frost after June 25.
- When is the first frost in Hibbing, MN?
- The average first fall frost (32°F) is September 8. There is a 1-in-10 chance of frost by August 23, so tender plants are at risk from that point on.
- How long is the growing season in 55746?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 93 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.