Harmon County, Oklahoma · Frost dates
Harmon County frost dates.
First-frost, last-frost, and growing-season length for Harmon County, Oklahoma. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-21
- 20%
- 04-16
- 50%
- 04-05
- 80%
- 03-24
- 90%
- 03-18
First fall frost
- 10%
- 10-16
- 20%
- 10-21
- 50%
- 10-31
- 80%
- 11-09
- 90%
- 11-14
28°F — killing freeze
Last spring freeze
- 10%
- 04-12
- 20%
- 04-06
- 50%
- 03-25
- 80%
- 03-11
- 90%
- 03-04
First fall freeze
- 10%
- 10-22
- 20%
- 10-30
- 50%
- 11-07
- 80%
- 11-19
- 90%
- 11-26
Growing season length (days, 28°F threshold)
- Short year
- 193
- Median
- 227
- Long year
- 267
Source NOAA station
HOLLIS 5E MESONET, OK US
4.2 mi · 30 yrs of record (1991–2020) · 1630 ft elev.
Data from HOLLIS 5E MESONET, OK US, 4.2 miles away with 30-year NOAA record (1991-2020).
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