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Resources · Climate

Acreage guides for towns in this county: Westlock

Location of Westlock County in Alberta
Westlock County within Alberta

Hardiness Zone in Westlock County

Westlock County is generally treated as Canadian plant hardiness zone 3b, with a frost-free window on the order of 120 days. The zone is read from the Natural Resources Canada plant hardiness map (4th edition, 1991–2020 normals) at a representative quarter; frost dates are a regional table keyed by zone, not a logger on your fence. Those two numbers decide more tree deaths than soil tests do.

Zone 3a with a frost-free window around 105 days supports canola, wheat, and barley, but late-May frost is a regular event. Low ground near the Pembina stays colder.

What the zone is — and is not

Agriculture and Agri-Food Canada’s plant hardiness maps combine several climate variables, not just one winter low. A zone 3b label means a typical winter in this belt, not the worst winter of the decade, and not the frost pocket at the bottom of your driveway.

Use it to:

Do not use it to:

Frost-free days in practice

120 days is a regional sketch. Last spring frost and first fall frost move with elevation, wet ground, and cold-air drainage. In Westlock County, watch:

A food forest that needs 130 days will fight this county most years. A shelterbelt of zone 3b natives will not.

Pair climate with water and sun

Zone is only one pillar. A 3b site with a 50 m well and 0.8 kWh/m²/day in winter is a different homestead than the same zone on a municipal line. Plan trees, wells, and panels on the same map.

Flood or wet ground near Pembina River, Tawatinaw River, Clyde Fen lowlands can also shorten the effective season by keeping soils cold in May.

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Sampled data for Westlock County

From a Land Intelligence report run on a representative quarter in Township 60, Range 26, W4. These are measured or record-based values for that location, shown to put the county figures above in context. They are not your parcel.

Annual mean2.5 °Clow -36.5 °C · high 29.4 °C in the sampled year
Days with frost177in the sampled year
Frost windowMay 15 – Sep 18regional table for zone 3b
Growing degree days1471base 5 °C
Precipitation466.1 mm/yr30-year normal at the sample point
Monthly average high and low temperature, Westlock County-25250 °CJanFebMarAprMayJunJulAugSepOctNovDecJan: average high -5.8 °C, average low -14.6 °CJan: average high -5.8 °C, average low -14.6 °CFeb: average high -4.8 °C, average low -13.6 °CFeb: average high -4.8 °C, average low -13.6 °CMar: average high -3.3 °C, average low -13.2 °CMar: average high -3.3 °C, average low -13.2 °CApr: average high 4.1 °C, average low -4.7 °CApr: average high 4.1 °C, average low -4.7 °CMay: average high 18.4 °C, average low 6.2 °CMay: average high 18.4 °C, average low 6.2 °CJun: average high 18.2 °C, average low 9.5 °CJun: average high 18.2 °C, average low 9.5 °CJul: average high 22.4 °C, average low 12.6 °CJul: average high 22.4 °C, average low 12.6 °CAug: average high 21.2 °C, average low 10.8 °CAug: average high 21.2 °C, average low 10.8 °CSep: average high 17 °C, average low 7 °CSep: average high 17 °C, average low 7 °COct: average high 10.3 °C, average low 0.9 °COct: average high 10.3 °C, average low 0.9 °CNov: average high 0.9 °C, average low -5.9 °CNov: average high 0.9 °C, average low -5.9 °CDec: average high -12.4 °C, average low -21.9 °CDec: average high -12.4 °C, average low -21.9 °C22.4 °C-21.9 °CAverage daily highAverage daily low
Open-Meteo daily archive (ERA5 reanalysis), 2025-10-08 to 2026-10-08: one recent year at the sample point, not a 30-year normal. Use it for the shape of the year, not for a design value.

Growing zones near Westlock County: Westlock (zone 3b) · Barrhead (zone 3a) · Morinville (zone 3b) · St. Albert (zone 4a) · Alberta growing zones map

Neighbouring counties: County of Barrhead (36 km) · Sturgeon County (43 km) · Thorhild County (49 km) · Lac Ste. Anne County (57 km) · Compare Westlock County with another county

Sampled from the live report pipeline at a representative quarter in Township 60, Range 26, W4 on 2026-10-08: well depth, hardiness zone, solar irradiance (150 well records within 5 km). Text reviewed 2026-10-09. Methodology.

Common questions

What should I plant in Westlock County?

Start with zone 3b stock and a 120-day season. Then walk frost pockets.

Is the town of Westlock the same zone?

Often close, not identical. Elevation and cold-air drainage on a rural lot can run colder than town.

Also for this county