Frost dates for 55003Bayport, MN
The average last spring frost in Bayport is April 22 and the average first fall frost is October 19, giving a typical growing season of about 178 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 22
- Average first fall frost
- Oct 19
- Growing season
- 178 days
Safer after May 6 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 172 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 19 · May 2 · May 17 | Sep 25 · Oct 8 · Oct 23 | 158 days | 100% |
| Frost / freeze (32°F) | Apr 7 · Apr 22 · May 6 | Oct 3 · Oct 19 · Nov 3 | 178 days | 100% |
| Hard freeze (28°F) | Mar 31 · Apr 12 · Apr 27 | Oct 15 · Oct 30 · Nov 11 | 199 days | 100% |
Planting calendar for Bayport
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 | Mar 22 – May 28 |
| Tomatoes | Transplant outdoors | May 8 – Jun 29 |
| Peppers | Start seeds indoors | Mar 22 – Apr 22 |
| Peppers | Transplant outdoors | May 22 – Jun 22 |
| Eggplant | Start seeds indoors | Apr 8 – May 7 |
| Eggplant | Transplant outdoors | May 22 – Jun 22 |
| Cucumbers | Sow outdoors | May 22 – Jul 9 |
| Summer squash | Sow outdoors | May 8 – Jun 22 |
| Winter squash & pumpkins | Sow outdoors | May 22 – Jun 22 |
| Snap beans | Sow outdoors | May 8 – Aug 1 |
| Sweet corn | Sow outdoors | May 8 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 22 – Jun 22 |
| Okra | Sow outdoors | May 15 – Jun 7 |
| Peas | Sow outdoors (spring) | Mar 22 – May 7 |
| Potatoes | Plant outdoors (spring) | Mar 22 – May 22 |
| Onions | Start seeds indoors (spring) | Feb 8 – Mar 7 |
| Onions | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (spring) | Mar 4 – Apr 7 |
| Broccoli | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 22 – Mar 22 |
| Cabbage | Transplant outdoors (spring) | Mar 22 – Apr 22 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 22 – Jun 7 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 15 – Apr 28 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 22 – May 12 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 8 – Apr 28 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 55003 is matched to the NOAA station Stillwater 1 Se, MN, 2.5 km away, at 710 ft elevation (25 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Stillwater 1 Se, MN (used) | 710 ft | Apr 22 | Oct 19 |
| Stillwater 2Sw, MN | 898 ft | Apr 30 | Oct 11 |
| St Paul, MN | 900 ft | Apr 26 | Oct 12 |
| River Falls, WI | 940 ft | May 11 | Oct 1 |
Frost dates near Bayport
- Houlton, WI 54082 · last Apr 30, first Oct 11
- Hudson, WI 54016 · last May 11, first Oct 1
- Stillwater, MN 55082 · last Apr 30, first Oct 11
- Lakeland, MN 55043 · last Apr 23, first Oct 19
- Lake Elmo, MN 55042 · last Apr 23, first Oct 20
- Saint Paul, MN 55128 · last Apr 23, first Oct 20
- Willernie, MN 55090 · last Apr 23, first Oct 20
- Somerset, WI 54025 · last May 3, first Oct 5
Frequently asked questions
- When is the last frost in Bayport, MN?
- For ZIP code 55003, the average last spring frost (32°F) is April 22, based on NOAA 1991-2020 climate normals for the Stillwater 1 Se, MN weather station. There is a 1-in-10 chance of a frost after May 6.
- When is the first frost in Bayport, MN?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 3, so tender plants are at risk from that point on.
- How long is the growing season in 55003?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 178 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.