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Chill hours in 55616

The short answer

55616 averages 976 chill hours per winter (6581,364 across 10 years) in USDA zone 3b.
55616 climate
Average chill hours976 (658–1,364 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically May 4 – May 20
First fall frosttypically September 29 – October 24

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 55616’s chill hours and zone:

How many chill hours does 55616 get?
55616 averages 976 chill hours per winter, ranging from 658 to 1364 across the last 10 years.
What hardiness zone is 55616?
55616 is in USDA hardiness zone 3b.

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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