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Chill hours in G3L

The short answer

G3L averages 1,009 chill hours per winter (7421,440 across 10 years) in USDA zone 4b.
G3L climate
Average chill hours1,009 (742–1,440 across 10 winters)
USDA hardiness zone4b (NRCan zone 4a)
Last spring frosttypically May 9 – May 28
First fall frosttypically October 3 – October 27

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 G3L’s chill hours and zone:

How many chill hours does G3L get?
G3L averages 1009 chill hours per winter, ranging from 742 to 1440 across the last 10 years.
What hardiness zone is G3L?
G3L 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