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Chill hours in 55613

The short answer

55613 averages 1,047 chill hours per winter (6621,455 across 10 years) in USDA zone 4b.
55613 climate
Average chill hours1,047 (662–1,455 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically May 4 – May 16
First fall frosttypically October 16 – November 2

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 55613’s chill hours and zone:

How many chill hours does 55613 get?
55613 averages 1047 chill hours per winter, ranging from 662 to 1455 across the last 10 years.
What hardiness zone is 55613?
55613 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