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Chill hours in 55387

The short answer

55387 averages 1,179 chill hours per winter (9771,451 across 10 years) in USDA zone 4b.
55387 climate
Average chill hours1,179 (977–1,451 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 13 – 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 55387’s chill hours and zone:

How many chill hours does 55387 get?
55387 averages 1179 chill hours per winter, ranging from 977 to 1451 across the last 10 years.
What hardiness zone is 55387?
55387 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