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Chill hours in 55155

The short answer

55155 averages 1,201 chill hours per winter (1,0171,474 across 10 years) in USDA zone 4b.
55155 climate
Average chill hours1,201 (1,017–1,474 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 55155’s chill hours and zone:

How many chill hours does 55155 get?
55155 averages 1201 chill hours per winter, ranging from 1017 to 1474 across the last 10 years.
What hardiness zone is 55155?
55155 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