Macon County, Illinois · Frost dates
Macon County frost dates.
First-frost, last-frost, and growing-season length for Macon County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-01
- 20%
- 04-24
- 50%
- 04-14
- 80%
- 04-05
- 90%
- 04-01
First fall frost
- 10%
- 10-11
- 20%
- 10-15
- 50%
- 10-24
- 80%
- 11-01
- 90%
- 11-05
28°F — killing freeze
Last spring freeze
- 10%
- 04-17
- 20%
- 04-11
- 50%
- 04-03
- 80%
- 03-25
- 90%
- 03-18
First fall freeze
- 10%
- 10-20
- 20%
- 10-26
- 50%
- 11-03
- 80%
- 11-12
- 90%
- 11-19
Growing season length (days, 28°F threshold)
- Short year
- 186
- Median
- 214
- Long year
- 246
Source NOAA station
DECATUR WTP, IL US
2.2 mi · 30 yrs of record (1991–2020) · 639 ft elev.
Data from DECATUR WTP, IL US, 2.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.