Bonner County, Idaho · Frost dates
Bonner County frost dates.
First-frost, last-frost, and growing-season length for Bonner County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-25
- 20%
- 05-20
- 50%
- 05-08
- 80%
- 04-28
- 90%
- 04-23
First fall frost
- 10%
- 09-11
- 20%
- 09-18
- 50%
- 09-28
- 80%
- 10-05
- 90%
- 10-11
28°F — killing freeze
Last spring freeze
- 10%
- 05-07
- 20%
- 05-01
- 50%
- 04-21
- 80%
- 04-06
- 90%
- 03-31
First fall freeze
- 10%
- 09-25
- 20%
- 10-01
- 50%
- 10-10
- 80%
- 10-22
- 90%
- 10-29
Growing season length (days, 28°F threshold)
- Short year
- 141
- Median
- 172
- Long year
- 212
Source NOAA station
SANDPOINT EXP STN, ID US
3.6 mi · 30 yrs of record (1991–2020) · 2126 ft elev.
Data from SANDPOINT EXP STN, ID US, 3.6 miles away with 30-year NOAA record (1991-2020).
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