Frost Dates for Round Lake Beach, IL
In Round Lake Beach, IL, the average last spring frost is around Apr 24 and the average first fall frost around Oct 23, for a growing season of about 180 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 Lake Villa 2Ne, IL weather station, 4 miles away, elevation 840 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 8 |
| 20% | May 4 | Oct 13 |
| 30% | Apr 30 | Oct 17 |
| 40% | Apr 27 | Oct 20 |
| 50% | Apr 24 | Oct 23 |
| 60% | Apr 21 | Oct 25 |
| 70% | Apr 19 | Oct 28 |
| 80% | Apr 16 | Oct 31 |
| 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 24 | Oct 23 |
| Hard freeze (28°F) | Apr 13 | Nov 3 |
Planting calendar for Round Lake Beach
Transplant May 1 – May 15
Transplant May 8 – May 22
Transplant May 8 – May 22
Transplant May 1 – May 15
Sow or transplant May 1 – May 15
Sow or transplant May 1 – May 15
Sow or transplant May 8 – May 22
Sow or transplant Mar 27 – Apr 10
Fall sowing Aug 28 – Sep 25
Fall sowing Aug 28 – Sep 18
Fall sowing Aug 14 – Aug 28
Sow or transplant Mar 27 – Apr 10
Fall sowing Aug 14 – Sep 11
Transplant Apr 10 – Apr 24
Fall sowing Jul 31 – Aug 14
Transplant Apr 3 – Apr 17
Fall sowing Jul 31 – Aug 14
Fall sowing Jul 31 – Aug 14
Fall sowing Sep 11 – Oct 2
Fall sowing Aug 14 – Aug 28
Plant Mar 27 – Apr 10
Based on the average last frost (Apr 24) and first frost (Oct 23). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.