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Chill hours in G3H

The short answer

G3H averages 1,119 chill hours per winter (8561,551 across 10 years) in USDA zone 4b.
G3H climate
Average chill hours1,119 (856–1,551 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 28 – May 15
First fall frosttypically October 18 – November 2

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 G3H’s chill hours and zone:

How many chill hours does G3H get?
G3H averages 1119 chill hours per winter, ranging from 856 to 1551 across the last 10 years.
What hardiness zone is G3H?
G3H 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