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Chill hours in 03771

The short answer

03771 averages 1,252 chill hours per winter (1,0411,694 across 10 years) in USDA zone 4b.
03771 climate
Average chill hours1,252 (1,041–1,694 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 28 – May 18
First fall frosttypically October 5 – October 23

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 03771’s chill hours and zone:

How many chill hours does 03771 get?
03771 averages 1252 chill hours per winter, ranging from 1041 to 1694 across the last 10 years.
What hardiness zone is 03771?
03771 is in USDA hardiness zone 4b.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026