How many chill hours does 70817 get?

70817 averages 488 chill hours per winter, ranging from 255 to 623 across the last 10 years.

What hardiness zone is 70817?

70817 is in USDA hardiness zone 9a.

Location almanac

The short answer

70817 averages 488 chill hours per winter (255–623 across 10 years) in USDA zone 9a.

70817 climate
Average chill hours	488 (255–623 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 19 – March 13
First fall frost	typically November 13 – December 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 70817’s chill hours and zone:

Chill and zone requirements are comfortably met in 70817.

Show 36 more good fit varieties

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

How many chill hours does 70817 get?: 70817 averages 488 chill hours per winter, ranging from 255 to 623 across the last 10 years.
What hardiness zone is 70817?: 70817 is in USDA hardiness zone 9a.

Growing fruit trees in 70817? Get a care calendar anchored to this exact climate, with email reminders.

[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