Frost dates for 56550Hendrum, MN
The average last spring frost in Hendrum is May 9 and the average first fall frost is October 1, giving a typical growing season of about 143 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 1
- Growing season
- 143 days
Safer after May 23 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 195 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 5 · May 19 · May 31 | Sep 8 · Sep 21 · Oct 3 | 124 days | 100% |
| Frost / freeze (32°F) | Apr 26 · May 9 · May 23 | Sep 18 · Oct 1 · Oct 16 | 143 days | 100% |
| Hard freeze (28°F) | Apr 14 · Apr 30 · May 14 | Sep 27 · Oct 11 · Oct 26 | 161 days | 100% |
Planting calendar for Hendrum
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 11 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 21 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 14 |
| Sweet corn | Sow outdoors | May 25 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 56550 is matched to the NOAA station Georgetown 1 E, MN, 21.2 km away, at 885 ft elevation (25 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Georgetown 1 E, MN (used) | 885 ft | May 9 | Oct 1 |
| Ada, MN | 907 ft | May 11 | Sep 27 |
| Hillsboro 3 N, ND | 910 ft | May 2 | Oct 9 |
| Fargo Hector Intl Ap, ND | 900 ft | May 10 | Sep 30 |
Frost dates near Hendrum
- Halstad, MN 56548 · last May 11, first Sep 27
- Perley, MN 56574 · last May 9, first Oct 1
- Ada, MN 56510 · last May 11, first Sep 27
- Grandin, ND 58038 · last May 9, first Oct 1
- Georgetown, MN 56546 · last May 9, first Oct 1
- Argusville, ND 58005 · last May 9, first Oct 1
- Borup, MN 56519 · last May 11, first Sep 27
- Shelly, MN 56581 · last May 2, first Oct 9
Frequently asked questions
- When is the last frost in Hendrum, MN?
- For ZIP code 56550, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Georgetown 1 E, MN weather station. There is a 1-in-10 chance of a frost after May 23.
- When is the first frost in Hendrum, MN?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 56550?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 143 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.