Frost Dates for Leavenworth, KS
In Leavenworth, KS, the average last spring frost is around Apr 12 and the average first fall frost around Oct 27, for a growing season of about 196 days. For frost-tender plants, wait until Apr 25, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Leavenworth, KS weather station, under 1 mile away, elevation 870 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 25 | Oct 13 |
| 20% | Apr 21 | Oct 18 |
| 30% | Apr 17 | Oct 22 |
| 40% | Apr 14 | Oct 25 |
| 50% | Apr 12 | Oct 27 |
| 60% | Apr 9 | Oct 29 |
| 70% | Apr 6 | Nov 1 |
| 80% | Apr 3 | Nov 3 |
| 90% | Mar 31 | Nov 7 |
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 21 | Oct 18 |
| Frost / freeze (32°F) | Apr 12 | Oct 27 |
| Hard freeze (28°F) | Apr 3 | Nov 4 |
Planting calendar for Leavenworth
Transplant Apr 19 – May 3
Transplant Apr 26 – May 10
Transplant Apr 26 – May 10
Transplant Apr 19 – May 3
Sow or transplant Apr 19 – May 3
Sow or transplant Apr 19 – May 3
Sow or transplant Apr 26 – May 10
Sow or transplant Mar 15 – Mar 29
Fall sowing Sep 1 – Sep 29
Fall sowing Sep 1 – Sep 22
Fall sowing Aug 18 – Sep 1
Sow or transplant Mar 15 – Mar 29
Fall sowing Aug 18 – Sep 15
Transplant Mar 29 – Apr 12
Fall sowing Aug 4 – Aug 18
Transplant Mar 22 – Apr 5
Fall sowing Aug 4 – Aug 18
Fall sowing Aug 4 – Aug 18
Fall sowing Sep 15 – Oct 6
Fall sowing Aug 18 – Sep 1
Plant Mar 15 – Mar 29
Based on the average last frost (Apr 12) and first frost (Oct 27). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.