How many chill hours does 05903 get?

05903 averages 1068 chill hours per winter, ranging from 854 to 1483 across the last 10 years.

What hardiness zone is 05903?

05903 is in USDA hardiness zone 4a.

Location almanac

The short answer

05903 averages 1,068 chill hours per winter (854–1,483 across 10 years) in USDA zone 4a.

05903 climate
Average chill hours	1,068 (854–1,483 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 10 – May 28
First fall frost	typically September 27 – October 23

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 05903’s chill hours and zone:

Chill and zone requirements are comfortably met in 05903.

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How many chill hours does 05903 get?: 05903 averages 1068 chill hours per winter, ranging from 854 to 1483 across the last 10 years.
What hardiness zone is 05903?: 05903 is in USDA hardiness zone 4a.

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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