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Chill hours in G3B

The short answer

G3B averages 1,027 chill hours per winter (7441,442 across 10 years) in USDA zone 4b.
G3B climate
Average chill hours1,027 (744–1,442 across 10 winters)
USDA hardiness zone4b (NRCan zone 4a)
Last spring frosttypically May 8 – May 28
First fall frosttypically September 24 – October 24

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 G3B’s chill hours and zone:

How many chill hours does G3B get?
G3B averages 1027 chill hours per winter, ranging from 744 to 1442 across the last 10 years.
What hardiness zone is G3B?
G3B 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