Stephenson County, Illinois · Frost dates
Stephenson County frost dates.
First-frost, last-frost, and growing-season length for Stephenson County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-06
- 50%
- 04-26
- 80%
- 04-16
- 90%
- 04-11
First fall frost
- 10%
- 09-30
- 20%
- 10-04
- 50%
- 10-13
- 80%
- 10-21
- 90%
- 10-26
28°F — killing freeze
Last spring freeze
- 10%
- 04-30
- 20%
- 04-25
- 50%
- 04-14
- 80%
- 04-04
- 90%
- 03-31
First fall freeze
- 10%
- 10-10
- 20%
- 10-15
- 50%
- 10-24
- 80%
- 11-01
- 90%
- 11-05
Growing season length (days, 28°F threshold)
- Short year
- 163
- Median
- 193
- Long year
- 219
Source NOAA station
FREEPORT WASTE WTP, IL US
4.8 mi · 30 yrs of record (1991–2020) · 750 ft elev.
Data from FREEPORT WASTE WTP, IL US, 4.8 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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