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Chill hours in 55733

The short answer

55733 averages 1,066 chill hours per winter (7581,470 across 10 years) in USDA zone 4b.
55733 climate
Average chill hours1,066 (758–1,470 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 27 – May 13
First fall frosttypically October 11 – November 14

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 55733’s chill hours and zone:

How many chill hours does 55733 get?
55733 averages 1066 chill hours per winter, ranging from 758 to 1470 across the last 10 years.
What hardiness zone is 55733?
55733 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