How many chill hours does 18661 get?

18661 averages 1548 chill hours per winter, ranging from 1300 to 1844 across the last 10 years.

What hardiness zone is 18661?

18661 is in USDA hardiness zone 6a.

Location almanac

The short answer

18661 averages 1,548 chill hours per winter (1,300–1,844 across 10 years) in USDA zone 6a.

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 18661’s chill hours and zone:

Chill and zone requirements are comfortably met in 18661.

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How many chill hours does 18661 get?: 18661 averages 1548 chill hours per winter, ranging from 1300 to 1844 across the last 10 years.
What hardiness zone is 18661?: 18661 is in USDA hardiness zone 6a.

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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