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Chill hours in G7H

The short answer

G7H averages 1,002 chill hours per winter (7811,314 across 10 years) in USDA zone 4b.
G7H climate
Average chill hours1,002 (781–1,314 across 10 winters)
USDA hardiness zone4b (NRCan zone 3b)
Last spring frosttypically May 9 – May 29
First fall frosttypically October 9 – November 3

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against G7H’s chill hours and zone:

How many chill hours does G7H get?
G7H averages 1002 chill hours per winter, ranging from 781 to 1314 across the last 10 years.
What hardiness zone is G7H?
G7H is in USDA hardiness zone 4b.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026