Frost Dates for Lake in the Hills, IL
In Lake in the Hills, IL, the average last spring frost is around Apr 25 and the average first fall frost around Oct 22, for a growing season of about 179 days. For frost-tender plants, wait until May 9, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Crystal Lake 4Nw, IL weather station, 7 miles away, elevation 940 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 9 | Oct 7 |
| 20% | May 4 | Oct 13 |
| 30% | May 1 | Oct 17 |
| 40% | Apr 28 | Oct 19 |
| 50% | Apr 25 | Oct 22 |
| 60% | Apr 22 | Oct 25 |
| 70% | Apr 19 | Oct 27 |
| 80% | Apr 16 | Oct 30 |
| 90% | Apr 11 | 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) | May 5 | Oct 11 |
| Frost / freeze (32°F) | Apr 25 | Oct 22 |
| Hard freeze (28°F) | Apr 12 | Nov 1 |
Planting calendar for Lake in the Hills
Transplant May 2 – May 16
Transplant May 9 – May 23
Transplant May 9 – May 23
Transplant May 2 – May 16
Sow or transplant May 2 – May 16
Sow or transplant May 2 – May 16
Sow or transplant May 9 – May 23
Sow or transplant Mar 28 – Apr 11
Fall sowing Aug 27 – Sep 24
Fall sowing Aug 27 – Sep 17
Fall sowing Aug 13 – Aug 27
Sow or transplant Mar 28 – Apr 11
Fall sowing Aug 13 – Sep 10
Transplant Apr 11 – Apr 25
Fall sowing Jul 30 – Aug 13
Transplant Apr 4 – Apr 18
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 28 – Apr 11
Based on the average last frost (Apr 25) and first frost (Oct 22). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.