Frost Dates for Derby, KS
In Derby, KS, the average last spring frost is around Apr 14 and the average first fall frost around Oct 22, for a growing season of about 189 days. For frost-tender plants, wait until Apr 30, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Haysville 3Se, KS weather station, 4 miles away, elevation 1,240 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 30 | Oct 5 |
| 20% | Apr 24 | Oct 12 |
| 30% | Apr 21 | Oct 16 |
| 40% | Apr 17 | Oct 19 |
| 50% | Apr 14 | Oct 22 |
| 60% | Apr 12 | Oct 24 |
| 70% | Apr 8 | Oct 27 |
| 80% | Apr 4 | Oct 30 |
| 90% | Mar 30 | Nov 4 |
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 24 | Oct 12 |
| Frost / freeze (32°F) | Apr 14 | Oct 22 |
| Hard freeze (28°F) | Apr 3 | Oct 31 |
Planting calendar for Derby
Transplant Apr 21 – May 5
Transplant Apr 28 – May 12
Transplant Apr 28 – May 12
Transplant Apr 21 – May 5
Sow or transplant Apr 21 – May 5
Sow or transplant Apr 21 – May 5
Sow or transplant Apr 28 – May 12
Sow or transplant Mar 17 – Mar 31
Fall sowing Aug 27 – Sep 24
Fall sowing Aug 27 – Sep 17
Fall sowing Aug 13 – Aug 27
Sow or transplant Mar 17 – Mar 31
Fall sowing Aug 13 – Sep 10
Transplant Mar 31 – Apr 14
Fall sowing Jul 30 – Aug 13
Transplant Mar 24 – Apr 7
Fall sowing Jul 30 – Aug 13
Fall sowing Jul 30 – Aug 13
Fall sowing Sep 10 – Oct 1
Fall sowing Aug 13 – Aug 27
Plant Mar 17 – Mar 31
Based on the average last frost (Apr 14) and first frost (Oct 22). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.