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Chill hours in 55333

The short answer

55333 averages 1,124 chill hours per winter (8121,335 across 10 years) in USDA zone 4b.
55333 climate
Average chill hours1,124 (812–1,335 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 22 – May 10
First fall frosttypically October 12 – October 28

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 55333’s chill hours and zone:

How many chill hours does 55333 get?
55333 averages 1124 chill hours per winter, ranging from 812 to 1335 across the last 10 years.
What hardiness zone is 55333?
55333 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