Frost Dates for Louisville/Jefferson County metro government, KY
In Louisville/Jefferson County metro government, KY, the average last spring frost is around Apr 6 and the average first fall frost around Nov 1, for a growing season of about 209 days. For frost-tender plants, wait until Apr 23, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Louisville Wfo, KY weather station, 3 miles away, elevation 632 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% | Apr 23 | Oct 21 |
| 20% | Apr 17 | Oct 25 |
| 30% | Apr 13 | Oct 29 |
| 40% | Apr 9 | Oct 31 |
| 50% | Apr 6 | Nov 1 |
| 60% | Apr 3 | Nov 3 |
| 70% | Mar 31 | Nov 6 |
| 80% | Mar 28 | Nov 10 |
| 90% | Mar 23 | Nov 15 |
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) | Apr 19 | Oct 23 |
| Frost / freeze (32°F) | Apr 6 | Nov 1 |
| Hard freeze (28°F) | Mar 26 | Nov 11 |
Planting calendar for Louisville/Jefferson County metro government
Transplant Apr 13 – Apr 27
Transplant Apr 20 – May 4
Transplant Apr 20 – May 4
Transplant Apr 13 – Apr 27
Sow or transplant Apr 13 – Apr 27
Sow or transplant Apr 13 – Apr 27
Sow or transplant Apr 20 – May 4
Sow or transplant Mar 9 – Mar 23
Fall sowing Sep 6 – Oct 4
Fall sowing Sep 6 – Sep 27
Fall sowing Aug 23 – Sep 6
Sow or transplant Mar 9 – Mar 23
Fall sowing Aug 23 – Sep 20
Transplant Mar 23 – Apr 6
Fall sowing Aug 9 – Aug 23
Transplant Mar 16 – Mar 30
Fall sowing Aug 9 – Aug 23
Fall sowing Aug 9 – Aug 23
Fall sowing Sep 20 – Oct 11
Fall sowing Aug 23 – Sep 6
Plant Mar 9 – Mar 23
Based on the average last frost (Apr 6) and first frost (Nov 1). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.