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Chill hours in 56310

The short answer

56310 averages 1,107 chill hours per winter (8351,455 across 10 years) in USDA zone 4b.
56310 climate
Average chill hours1,107 (835–1,455 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 19 – April 28
First fall frosttypically October 11 – November 19

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 56310’s chill hours and zone:

How many chill hours does 56310 get?
56310 averages 1107 chill hours per winter, ranging from 835 to 1455 across the last 10 years.
What hardiness zone is 56310?
56310 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