How many chill hours does 99741 get?

99741 averages 793 chill hours per winter, ranging from 599 to 1023 across the last 10 years.

What hardiness zone is 99741?

99741 is in USDA hardiness zone 1b.

Location almanac

The short answer

99741 averages 793 chill hours per winter (599–1,023 across 10 years) in USDA zone 1b.

99741 climate
Average chill hours	793 (599–1,023 across 10 winters)
USDA hardiness zone	1b
Last spring frost	typically May 6 – May 29
First fall frost	typically September 17 – September 27

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 99741’s chill hours and zone:

Chill and zone requirements are comfortably met in 99741.

Show 18 more good fit varieties

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

How many chill hours does 99741 get?: 99741 averages 793 chill hours per winter, ranging from 599 to 1023 across the last 10 years.
What hardiness zone is 99741?: 99741 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