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 (19912020) · 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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