Mercer County, New Jersey · Frost dates
Mercer County frost dates.
First-frost, last-frost, and growing-season length for Mercer County, New Jersey. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 05-06
- 20%
- 04-30
- 50%
- 04-17
- 80%
- 04-07
- 90%
- 04-02
First fall frost
- 10%
- 10-11
- 20%
- 10-16
- 50%
- 10-28
- 80%
- 11-05
- 90%
- 11-10
28°F — killing freeze
Last spring freeze
- 10%
- 04-17
- 20%
- 04-12
- 50%
- 04-02
- 80%
- 03-23
- 90%
- 03-18
First fall freeze
- 10%
- 10-25
- 20%
- 10-30
- 50%
- 11-07
- 80%
- 11-17
- 90%
- 11-24
Growing season length (days, 28°F threshold)
- Short year
- 191
- Median
- 219
- Long year
- 251
Source NOAA station
TRENTON STATE COLLEGE, NJ US
4.7 mi · 30 yrs of record (1991–2020) · 100 ft elev.
Data from TRENTON STATE COLLEGE, NJ US, 4.7 miles away with 30-year NOAA record (1991-2020).
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