How many chill hours does 99773 get?

99773 averages 632 chill hours per winter, ranging from 366 to 846 across the last 10 years.

What hardiness zone is 99773?

99773 is in USDA hardiness zone 1b.

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The short answer

99773 averages 632 chill hours per winter (366–846 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 99773’s chill hours and zone:

Chill and zone requirements are comfortably met in 99773.

Show 5 more good fit varieties

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

How many chill hours does 99773 get?: 99773 averages 632 chill hours per winter, ranging from 366 to 846 across the last 10 years.
What hardiness zone is 99773?: 99773 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