Frost Dates for Franklin, WI
In Franklin, WI, the average last spring frost is around May 3 and the average first fall frost around Oct 14, for a growing season of about 162 days. For frost-tender plants, wait until May 19, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Hales Corners/Whitnall Park/Bo, WI weather station, 4 miles away, elevation 774 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 19 | Sep 30 |
| 20% | May 13 | Oct 5 |
| 30% | May 9 | Oct 8 |
| 40% | May 5 | Oct 11 |
| 50% | May 3 | Oct 14 |
| 60% | Apr 30 | Oct 16 |
| 70% | Apr 27 | Oct 19 |
| 80% | Apr 23 | Oct 22 |
| 90% | Apr 18 | Oct 26 |
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 14 | Oct 3 |
| Frost / freeze (32°F) | May 3 | Oct 14 |
| Hard freeze (28°F) | Apr 21 | Oct 24 |
Planting calendar for Franklin
Transplant May 10 – May 24
Transplant May 17 – May 31
Transplant May 17 – May 31
Transplant May 10 – May 24
Sow or transplant May 10 – May 24
Sow or transplant May 10 – May 24
Sow or transplant May 17 – May 31
Sow or transplant Apr 5 – Apr 19
Fall sowing Aug 19 – Sep 16
Fall sowing Aug 19 – Sep 9
Fall sowing Aug 5 – Aug 19
Sow or transplant Apr 5 – Apr 19
Fall sowing Aug 5 – Sep 2
Transplant Apr 19 – May 3
Fall sowing Jul 22 – Aug 5
Transplant Apr 12 – Apr 26
Fall sowing Jul 22 – Aug 5
Fall sowing Jul 22 – Aug 5
Fall sowing Sep 2 – Sep 23
Fall sowing Aug 5 – Aug 19
Plant Apr 5 – Apr 19
Based on the average last frost (May 3) and first frost (Oct 14). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.