St. Lawrence County, New York · Frost dates
St. Lawrence County frost dates.
First-frost, last-frost, and growing-season length for St. Lawrence County, New York. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-25
- 20%
- 05-19
- 50%
- 05-09
- 80%
- 04-30
- 90%
- 04-27
First fall frost
- 10%
- 09-16
- 20%
- 09-21
- 50%
- 09-30
- 80%
- 10-09
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-14
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-21
- 90%
- 04-18
First fall freeze
- 10%
- 09-25
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-23
- 90%
- 10-31
Growing season length (days, 28°F threshold)
- Short year
- 134
- Median
- 164
- Long year
- 196
Source NOAA station
CANTON 4 SE, NY US
6.4 mi · 30 yrs of record (1991–2020) · 448 ft elev.
Data from CANTON 4 SE, NY US, 6.4 miles away with 30-year NOAA record (1991-2020).
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