District of Columbia, District of Columbia · Frost dates
District of Columbia frost dates.
First-frost, last-frost, and growing-season length for District of Columbia, District of Columbia. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-11
- 20%
- 04-06
- 50%
- 03-29
- 80%
- 03-20
- 90%
- 03-15
First fall frost
- 10%
- 10-26
- 20%
- 10-31
- 50%
- 11-08
- 80%
- 11-17
- 90%
- 11-23
28°F — killing freeze
Last spring freeze
- 10%
- 03-31
- 20%
- 03-27
- 50%
- 03-17
- 80%
- 03-07
- 90%
- 03-02
First fall freeze
- 10%
- 11-06
- 20%
- 11-11
- 50%
- 11-20
- 80%
- 12-02
- 90%
- 12-07
Growing season length (days, 28°F threshold)
- Short year
- 220
- Median
- 248
- Long year
- 280
Source NOAA station
NATL ARBORETUM DC, MD US
2.6 mi · 30 yrs of record (1991–2020) · 50 ft elev.
Data from NATL ARBORETUM DC, MD US, 2.6 miles away with 30-year NOAA record (1991-2020).
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