Frost Dates for Galesburg, IL
In Galesburg, IL, the average last spring frost is around Apr 20 and the average first fall frost around Oct 19, for a growing season of about 180 days. For frost-tender plants, wait until May 5, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Galesburg, IL weather station, under 1 mile away, elevation 761 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 5 | Oct 4 |
| 20% | Apr 30 | Oct 10 |
| 30% | Apr 26 | Oct 13 |
| 40% | Apr 22 | Oct 16 |
| 50% | Apr 20 | Oct 19 |
| 60% | Apr 17 | Oct 22 |
| 70% | Apr 15 | Oct 24 |
| 80% | Apr 11 | Oct 27 |
| 90% | Apr 6 | Oct 30 |
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 30 | Oct 9 |
| Frost / freeze (32°F) | Apr 20 | Oct 19 |
| Hard freeze (28°F) | Apr 10 | Oct 28 |
Planting calendar for Galesburg
Transplant Apr 27 – May 11
Transplant May 4 – May 18
Transplant May 4 – May 18
Transplant Apr 27 – May 11
Sow or transplant Apr 27 – May 11
Sow or transplant Apr 27 – May 11
Sow or transplant May 4 – May 18
Sow or transplant Mar 23 – Apr 6
Fall sowing Aug 24 – Sep 21
Fall sowing Aug 24 – Sep 14
Fall sowing Aug 10 – Aug 24
Sow or transplant Mar 23 – Apr 6
Fall sowing Aug 10 – Sep 7
Transplant Apr 6 – Apr 20
Fall sowing Jul 27 – Aug 10
Transplant Mar 30 – Apr 13
Fall sowing Jul 27 – Aug 10
Fall sowing Jul 27 – Aug 10
Fall sowing Sep 7 – Sep 28
Fall sowing Aug 10 – Aug 24
Plant Mar 23 – Apr 6
Based on the average last frost (Apr 20) and first frost (Oct 19). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.