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Chill hours in 56378

The short answer

56378 averages 1,067 chill hours per winter (7351,423 across 10 years) in USDA zone 4b.
56378 climate
Average chill hours1,067 (735–1,423 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 11
First fall frosttypically October 5 – November 13

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 56378’s chill hours and zone:

How many chill hours does 56378 get?
56378 averages 1067 chill hours per winter, ranging from 735 to 1423 across the last 10 years.
What hardiness zone is 56378?
56378 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