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Chill hours in T9C

The short answer

T9C averages 1,041 chill hours per winter (6521,282 across 10 years) in USDA zone 3b.
T9C climate
Average chill hours1,041 (652–1,282 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically April 29 – May 21
First fall frosttypically September 28 – October 10

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 T9C’s chill hours and zone:

How many chill hours does T9C get?
T9C averages 1041 chill hours per winter, ranging from 652 to 1282 across the last 10 years.
What hardiness zone is T9C?
T9C is in USDA hardiness zone 3b.

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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