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Chill hours in T9S

The short answer

T9S averages 1,063 chill hours per winter (8321,331 across 10 years) in USDA zone 3b.
T9S climate
Average chill hours1,063 (832–1,331 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically April 26 – May 21
First fall frosttypically September 27 – October 13

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 T9S’s chill hours and zone:

How many chill hours does T9S get?
T9S averages 1063 chill hours per winter, ranging from 832 to 1331 across the last 10 years.
What hardiness zone is T9S?
T9S 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