LaSalle County, Illinois · Frost dates
LaSalle County frost dates.
First-frost, last-frost, and growing-season length for LaSalle County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-05
- 20%
- 04-30
- 50%
- 04-20
- 80%
- 04-11
- 90%
- 04-06
First fall frost
- 10%
- 10-07
- 20%
- 10-13
- 50%
- 10-22
- 80%
- 10-30
- 90%
- 11-04
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-19
- 50%
- 04-08
- 80%
- 03-31
- 90%
- 03-24
First fall freeze
- 10%
- 10-19
- 20%
- 10-24
- 50%
- 11-01
- 80%
- 11-10
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 178
- Median
- 207
- Long year
- 236
Source NOAA station
OTTAWA 5SW, IL US
1.6 mi · 30 yrs of record (1991–2020) · 525 ft elev.
Data from OTTAWA 5SW, IL US, 1.6 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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