Boise County, Idaho · Frost dates
Boise County frost dates.
First-frost, last-frost, and growing-season length for Boise County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 07-01
- 20%
- 06-22
- 50%
- 06-06
- 80%
- 05-25
- 90%
- 05-18
First fall frost
- 10%
- 08-19
- 20%
- 08-25
- 50%
- 09-04
- 80%
- 09-18
- 90%
- 09-24
28°F — killing freeze
Last spring freeze
- 10%
- 06-04
- 20%
- 05-29
- 50%
- 05-15
- 80%
- 05-05
- 90%
- 04-30
First fall freeze
- 10%
- 09-04
- 20%
- 09-11
- 50%
- 09-23
- 80%
- 10-03
- 90%
- 10-08
Growing season length (days, 28°F threshold)
- Short year
- 92
- Median
- 131
- Long year
- 161
Source NOAA station
LOWMAN, ID US
8.2 mi · 30 yrs of record (1991–2020) · 3920 ft elev.
Data from LOWMAN, ID US, 8.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.