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Chill hours in P0H

The short answer

P0H averages 1,236 chill hours per winter (9891,552 across 10 years) in USDA zone 4b.
P0H climate
Average chill hours1,236 (989–1,552 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 27 – May 16
First fall frosttypically October 18 – November 4

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 P0H’s chill hours and zone:

How many chill hours does P0H get?
P0H averages 1236 chill hours per winter, ranging from 989 to 1552 across the last 10 years.
What hardiness zone is P0H?
P0H 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