How many chill hours does 40921 get?

40921 averages 1324 chill hours per winter, ranging from 1107 to 1705 across the last 10 years.

What hardiness zone is 40921?

40921 is in USDA hardiness zone 7a.

Location almanac

The short answer

40921 averages 1,324 chill hours per winter (1,107–1,705 across 10 years) in USDA zone 7a.

40921 climate
Average chill hours	1,324 (1,107–1,705 across 10 winters)
USDA hardiness zone	7a
Last spring frost	typically March 29 – April 22
First fall frost	typically November 1 – November 22

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 40921’s chill hours and zone:

Chill and zone requirements are comfortably met in 40921.

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How many chill hours does 40921 get?: 40921 averages 1324 chill hours per winter, ranging from 1107 to 1705 across the last 10 years.
What hardiness zone is 40921?: 40921 is in USDA hardiness zone 7a.

Growing fruit trees in 40921? 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