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Chill hours in G5Y

The short answer

G5Y averages 1,199 chill hours per winter (9941,610 across 10 years) in USDA zone 4b.
G5Y climate
Average chill hours1,199 (994–1,610 across 10 winters)
USDA hardiness zone4b (NRCan zone 4a)
Last spring frosttypically May 7 – May 18
First fall frosttypically October 3 – October 30

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 G5Y’s chill hours and zone:

How many chill hours does G5Y get?
G5Y averages 1199 chill hours per winter, ranging from 994 to 1610 across the last 10 years.
What hardiness zone is G5Y?
G5Y 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