How many chill hours does 99726 get?

99726 averages 615 chill hours per winter, ranging from 433 to 810 across the last 10 years.

What hardiness zone is 99726?

99726 is in USDA hardiness zone 1b.

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The short answer

99726 averages 615 chill hours per winter (433–810 across 10 years) in USDA zone 1b.

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 99726’s chill hours and zone:

Chill and zone requirements are comfortably met in 99726.

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Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99726 get?: 99726 averages 615 chill hours per winter, ranging from 433 to 810 across the last 10 years.
What hardiness zone is 99726?: 99726 is in USDA hardiness zone 1b.

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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