Frost Dates for Richfield, MN
In Richfield, MN, the average last spring frost is around Apr 23 and the average first fall frost around Oct 18, for a growing season of about 176 days. For frost-tender plants, wait until May 7, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Minneapolis/St Paul Airport, MN weather station, 3 miles away, elevation 872 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 7 | Oct 1 |
| 20% | May 2 | Oct 7 |
| 30% | Apr 30 | Oct 11 |
| 40% | Apr 26 | Oct 15 |
| 50% | Apr 23 | Oct 18 |
| 60% | Apr 20 | Oct 21 |
| 70% | Apr 17 | Oct 23 |
| 80% | Apr 13 | Oct 27 |
| 90% | Apr 8 | Oct 31 |
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 3 | Oct 6 |
| Frost / freeze (32°F) | Apr 23 | Oct 18 |
| Hard freeze (28°F) | Apr 13 | Oct 29 |
Planting calendar for Richfield
Transplant Apr 30 – May 14
Transplant May 7 – May 21
Transplant May 7 – May 21
Transplant Apr 30 – May 14
Sow or transplant Apr 30 – May 14
Sow or transplant Apr 30 – May 14
Sow or transplant May 7 – May 21
Sow or transplant Mar 26 – Apr 9
Fall sowing Aug 23 – Sep 20
Fall sowing Aug 23 – Sep 13
Fall sowing Aug 9 – Aug 23
Sow or transplant Mar 26 – Apr 9
Fall sowing Aug 9 – Sep 6
Transplant Apr 9 – Apr 23
Fall sowing Jul 26 – Aug 9
Transplant Apr 2 – Apr 16
Fall sowing Jul 26 – Aug 9
Fall sowing Jul 26 – Aug 9
Fall sowing Sep 6 – Sep 27
Fall sowing Aug 9 – Aug 23
Plant Mar 26 – Apr 9
Based on the average last frost (Apr 23) and first frost (Oct 18). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.