How many chill hours does 55303 get?

55303 averages 1171 chill hours per winter, ranging from 978 to 1447 across the last 10 years.

What hardiness zone is 55303?

55303 is in USDA hardiness zone 4b.

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The short answer

55303 averages 1,171 chill hours per winter (978–1,447 across 10 years) in USDA zone 4b.

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 55303’s chill hours and zone:

Chill and zone requirements are comfortably met in 55303.

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How many chill hours does 55303 get?: 55303 averages 1171 chill hours per winter, ranging from 978 to 1447 across the last 10 years.
What hardiness zone is 55303?: 55303 is in USDA hardiness zone 4b.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026