Ada County, Idaho · Frost dates
Ada County frost dates.
First-frost, last-frost, and growing-season length for Ada County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-09
- 20%
- 05-04
- 50%
- 04-24
- 80%
- 04-12
- 90%
- 04-04
First fall frost
- 10%
- 10-05
- 20%
- 10-10
- 50%
- 10-21
- 80%
- 10-31
- 90%
- 11-05
28°F — killing freeze
Last spring freeze
- 10%
- 04-25
- 20%
- 04-18
- 50%
- 04-02
- 80%
- 03-18
- 90%
- 03-10
First fall freeze
- 10%
- 10-17
- 20%
- 10-21
- 50%
- 10-31
- 80%
- 11-13
- 90%
- 11-19
Growing season length (days, 28°F threshold)
- Short year
- 175
- Median
- 212
- Long year
- 254
Source NOAA station
BOISE AIR TERMINAL, ID US
8.0 mi · 30 yrs of record (1991–2020) · 2814 ft elev.
Data from BOISE AIR TERMINAL, ID US, 8 miles away with 30-year NOAA record (1991-2020).
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