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Chill hours in 55355

The short answer

55355 averages 1,070 chill hours per winter (6851,366 across 10 years) in USDA zone 4b.
55355 climate
Average chill hours1,070 (685–1,366 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 22 – April 28
First fall frosttypically October 17 – 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 55355’s chill hours and zone:

How many chill hours does 55355 get?
55355 averages 1070 chill hours per winter, ranging from 685 to 1366 across the last 10 years.
What hardiness zone is 55355?
55355 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