Boundary County, Idaho · Frost dates
Boundary County frost dates.
First-frost, last-frost, and growing-season length for Boundary County, Idaho. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-11
- 50%
- 04-30
- 80%
- 04-21
- 90%
- 04-16
First fall frost
- 10%
- 09-18
- 20%
- 09-23
- 50%
- 10-04
- 80%
- 10-14
- 90%
- 10-19
28°F — killing freeze
Last spring freeze
- 10%
- 04-30
- 20%
- 04-24
- 50%
- 04-10
- 80%
- 03-31
- 90%
- 03-26
First fall freeze
- 10%
- 09-28
- 20%
- 10-03
- 50%
- 10-16
- 80%
- 10-29
- 90%
- 11-05
Growing season length (days, 28°F threshold)
- Short year
- 151
- Median
- 189
- Long year
- 224
Source NOAA station
BONNERS FERRY, ID US
11.2 mi · 30 yrs of record (1991–2020) · 2075 ft elev.
Data from BONNERS FERRY, ID US, 11.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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