How many chill hours does 99720 get?

99720 averages 617 chill hours per winter, ranging from 411 to 817 across the last 10 years.

What hardiness zone is 99720?

99720 is in USDA hardiness zone 1a.

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The short answer

99720 averages 617 chill hours per winter (411–817 across 10 years) in USDA zone 1a.

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 99720’s chill hours and zone:

Chill and zone requirements are comfortably met in 99720.

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

How many chill hours does 99720 get?: 99720 averages 617 chill hours per winter, ranging from 411 to 817 across the last 10 years.
What hardiness zone is 99720?: 99720 is in USDA hardiness zone 1a.

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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