How many chill hours does 99540 get?

99540 averages 824 chill hours per winter, ranging from 415 to 1058 across the last 10 years.

What hardiness zone is 99540?

99540 is in USDA hardiness zone 5b.

Location almanac

The short answer

99540 averages 824 chill hours per winter (415–1,058 across 10 years) in USDA zone 5b.

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 99540’s chill hours and zone:

Chill and zone requirements are comfortably met in 99540.

Show 116 more good fit varieties

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

How many chill hours does 99540 get?: 99540 averages 824 chill hours per winter, ranging from 415 to 1058 across the last 10 years.
What hardiness zone is 99540?: 99540 is in USDA hardiness zone 5b.

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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