Broomfield County, Colorado · Frost dates
Broomfield County frost dates.
First-frost, last-frost, and growing-season length for Broomfield County, Colorado. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-14
- 20%
- 05-09
- 50%
- 05-02
- 80%
- 04-23
- 90%
- 04-18
First fall frost
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-19
- 90%
- 10-24
28°F — killing freeze
Last spring freeze
- 10%
- 05-05
- 20%
- 05-01
- 50%
- 04-20
- 80%
- 04-09
- 90%
- 04-04
First fall freeze
- 10%
- 10-07
- 20%
- 10-11
- 50%
- 10-21
- 80%
- 10-30
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 155
- Median
- 184
- Long year
- 214
Source NOAA station
NORTHGLENN, CO US
4.3 mi · 30 yrs of record (1991–2020) · 5407 ft elev.
Data from NORTHGLENN, CO US, 4.3 miles away with 30-year NOAA record (1991-2020).
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