How many chill hours does 15521 get?

15521 averages 1575 chill hours per winter, ranging from 1268 to 1907 across the last 10 years.

What hardiness zone is 15521?

15521 is in USDA hardiness zone 6b.

Location almanac

The short answer

15521 averages 1,575 chill hours per winter (1,268–1,907 across 10 years) in USDA zone 6b.

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 15521’s chill hours and zone:

Chill and zone requirements are comfortably met in 15521.

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How many chill hours does 15521 get?: 15521 averages 1575 chill hours per winter, ranging from 1268 to 1907 across the last 10 years.
What hardiness zone is 15521?: 15521 is in USDA hardiness zone 6b.

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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