How many chill hours does 99660 get?

99660 averages 2908 chill hours per winter, ranging from 2285 to 3690 across the last 10 years.

What hardiness zone is 99660?

99660 is in USDA hardiness zone 6b.

Location almanac

The short answer

99660 averages 2,908 chill hours per winter (2,285–3,690 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 99660’s chill hours and zone:

Chill and zone requirements are comfortably met in 99660.

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How many chill hours does 99660 get?: 99660 averages 2908 chill hours per winter, ranging from 2285 to 3690 across the last 10 years.
What hardiness zone is 99660?: 99660 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