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Chill hours in G7J

The short answer

G7J averages 974 chill hours per winter (7451,325 across 10 years) in USDA zone 4b.
G7J climate
Average chill hours974 (745–1,325 across 10 winters)
USDA hardiness zone4b (NRCan zone 3b)
Last spring frosttypically May 4 – May 29
First fall frosttypically October 9 – October 29

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 G7J’s chill hours and zone:

Marginal (1)

Possible in a good year or a favorable microclimate — click through for the caveats.

Marginal varieties for this location
VarietyFruit
ReliancePeach
How many chill hours does G7J get?
G7J averages 974 chill hours per winter, ranging from 745 to 1325 across the last 10 years.
What hardiness zone is G7J?
G7J is in USDA hardiness zone 4b.

Growing fruit trees in G7J? Get a care calendar anchored to this exact climate, with email reminders.

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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