How many chill hours does 99774 get?

99774 averages 580 chill hours per winter, ranging from 364 to 751 across the last 10 years.

What hardiness zone is 99774?

99774 is in USDA hardiness zone 1a.

Location almanac

The short answer

99774 averages 580 chill hours per winter (364–751 across 10 years) in USDA zone 1a.

99774 climate
Average chill hours	580 (364–751 across 10 winters)
USDA hardiness zone	1a
Last spring frost	typically May 2 – May 19
First fall frost	typically September 18 – September 28

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 99774’s chill hours and zone:

Chill and zone requirements are comfortably met in 99774.

Show 3 more good fit varieties

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

How many chill hours does 99774 get?: 99774 averages 580 chill hours per winter, ranging from 364 to 751 across the last 10 years.
What hardiness zone is 99774?: 99774 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