Frost Dates for Winona, MN
In Winona, MN, the average last spring frost is around Apr 21 and the average first fall frost around Oct 19, for a growing season of about 180 days. For frost-tender plants, wait until May 4, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Winona, MN weather station, 2 miles away, elevation 652 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 4 | Oct 4 |
| 20% | May 1 | Oct 9 |
| 30% | Apr 28 | Oct 13 |
| 40% | Apr 24 | Oct 16 |
| 50% | Apr 21 | Oct 19 |
| 60% | Apr 18 | Oct 21 |
| 70% | Apr 15 | Oct 24 |
| 80% | Apr 11 | Oct 27 |
| 90% | Apr 7 | Nov 1 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 2 | Oct 8 |
| Frost / freeze (32°F) | Apr 21 | Oct 19 |
| Hard freeze (28°F) | Apr 9 | Oct 29 |
Planting calendar for Winona
Transplant Apr 28 – May 12
Transplant May 5 – May 19
Transplant May 5 – May 19
Transplant Apr 28 – May 12
Sow or transplant Apr 28 – May 12
Sow or transplant Apr 28 – May 12
Sow or transplant May 5 – May 19
Sow or transplant Mar 24 – Apr 7
Fall sowing Aug 24 – Sep 21
Fall sowing Aug 24 – Sep 14
Fall sowing Aug 10 – Aug 24
Sow or transplant Mar 24 – Apr 7
Fall sowing Aug 10 – Sep 7
Transplant Apr 7 – Apr 21
Fall sowing Jul 27 – Aug 10
Transplant Mar 31 – Apr 14
Fall sowing Jul 27 – Aug 10
Fall sowing Jul 27 – Aug 10
Fall sowing Sep 7 – Sep 28
Fall sowing Aug 10 – Aug 24
Plant Mar 24 – Apr 7
Based on the average last frost (Apr 21) and first frost (Oct 19). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.