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Acreage guides for towns in this county: Lethbridge

Location of Lethbridge County in Alberta
Lethbridge County within Alberta

Farming in Lethbridge County, Alberta: Water, Wells and Frost-Free Days

If you run a working farm in Lethbridge County, four things set your season: how much water you can count on, how long the frost-free window is, which fields are wet or regulated, and what it costs to fix them. County figures are a starting point for a farm plan. They are not a parcel survey.

Intensive irrigated agriculture: sugar beets, potatoes, beans, corn, and feedlots. Water allocation and irrigation district membership drive land value.

Well depth and water table for farm operators

Nearby well records suggest completed wells around 93 m deep in Lethbridge County, with static water levels often in the 6–57 m range. The predominant aquifer on file is Oldman and Foremost Formation sandstone with the Lethbridge buried-valley aquifer. These figures come from a Land Intelligence report run on a representative quarter in the county (SE 1-9-21-W4; 49 provincial well records within 5 km), not from your parcel.

Lethbridge County is irrigation country, and surface water from the St. Mary and Lethbridge Northern districts matters more than groundwater for most farms. Domestic wells tap Belly River Group sandstones or the buried valley under the city; chemistry varies and some areas rely on district pipelines.

For livestock, plan for peak summer demand and for winter freeze-up. For irrigation, a well rarely replaces a licensed surface source, and diverting water for irrigation generally needs a Water Act licence. Only a pump test tells you yield, and a county average does not.

Frost-free days and hardiness zone

Lethbridge County is generally treated as hardiness zone 4b, with a frost-free window on the order of 130 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.

Zone 4a with about 125 frost-free days and chinook winters that swing from thaw to deep cold. Heat units support corn, beans, and sugar beets under irrigation.

Match variety maturity to the shorter, colder number, not the longer one. After an early harvest, a cover crop needs seed in the ground fast, and a 4R nitrogen plan helps you time inputs to the season you actually get. More on the zone: hardiness zone in Lethbridge County.

Wetlands, sloughs, and flood limits on the field

Wetland density in Lethbridge County is best described as low. Notable mapped or commonly discussed flood-hazard areas include Oldman River valley, Little Bow River, St. Mary River Irrigation District canals.

Natural wetlands are sparse on the dry prairie, but irrigation return flows have created regulated wetlands and reservoirs. The Oldman River valley carries flood fringe limits.

Alberta regulates changes to wetlands and watercourses. Draining, filling, or ditching a wet area can require approval under the Water Act, even when it looks like a low spot in a field. Read the Alberta wetland policy guide before you order a ditcher, and price field drainage only after you know what is allowed.

Work packages farm operators ask about

Check grant fit before you spend

Alberta's producer programs run through Sustainable CAP, with streams for water, landscapes, efficiency, and value-added work. The federal On-Farm Climate Action Fund has supported nitrogen management, cover crops, and rotational grazing. Rates, caps, and intake change, so use the grant eligibility quiz to see what may apply, then confirm with the program administrator.

Sampled data for Lethbridge County

From a Land Intelligence report run on a representative quarter in Township 9, Range 21, 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.

Median completed depth30.1 m49 records within 5 km of the sample
Middle half of wells15.3–75.6 mshallowest 6.5 m · deepest 679.7 m
Median static level19.8 mbelow ground, where recorded
Annual mean7.6 °Clow -25.7 °C · high 35.8 °C in the sampled year
Days with frost141in the sampled year
Frost windowMay 8 – Sep 22regional table for zone 4b
Growing degree days2072base 5 °C
Precipitation380 mm/yr30-year normal at the sample point
Fixed south array yield982 kWh/kWp/yrlatitude tilt, rough feasibility only
Annual insolation1259.3 kWh/m²global, horizontal
Soil at the sampleLoamDark Brown Chernozemics
Farmland value context$7,629/acretransfer average, FCC-trend adjusted; not an appraisal
Nearby well records in Lethbridge County: completed depth (down) versus distance from the sample point0 m170 m340 m510 m680 m0.0 km1.2 km2.5 km3.8 km5.0 kmmedian 30.1 m1.9 km away: completed 65.0 m, static level 53.0 m2.2 km away: completed 85.6 m2.6 km away: completed 7.6 m2.7 km away: completed 679.7 m2.8 km away: completed 94.3 m, static level 82.3 m3.3 km away: completed 93.3 m, static level 85.3 m3.5 km away: completed 85.1 m, static level 73.2 m3.5 km away: completed 42.5 m, static level 30.5 m3.6 km away: completed 91.4 m3.7 km away: completed 6.5 m, static level 75.3 m3.7 km away: completed 72.4 m, static level 55.5 m3.8 km away: completed 549.2 m4.1 km away: completed 69.9 m, static level 57.9 m4.1 km away: completed 42.5 m, static level 30.5 m4.1 km away: completed 39.7 m, static level 55.2 m4.1 km away: completed 95.1 m4.1 km away: completed 57.9 m4.2 km away: completed 16.5 m, static level 4.5 m4.2 km away: completed 17.1 m, static level 5.1 m4.2 km away: completed 21.3 m4.2 km away: completed 9.1 m4.4 km away: completed 87.3 m, static level 73.8 m4.4 km away: completed 69.5 m4.4 km away: completed 10.7 m4.5 km away: completed 12.0 m, static level 4.0 m4.6 km away: completed 31.7 m4.6 km away: completed 17.1 m, static level 9.1 m4.6 km away: completed 15.3 m, static level 7.3 m4.6 km away: completed 549.2 m4.6 km away: completed 13.2 m, static level 5.2 m4.6 km away: completed 15.0 m, static level 7.0 m4.6 km away: completed 12.8 m, static level 7.1 m4.6 km away: completed 12.8 m, static level 6.4 m4.7 km away: completed 28.8 m, static level 5.5 m4.7 km away: completed 31.5 m, static level 2.2 m4.7 km away: completed 22.4 m4.7 km away: completed 22.1 m4.7 km away: completed 20.7 m4.7 km away: completed 26.3 m4.7 km away: completed 15.2 m
Each dot is one provincial well record near the sampled quarter: distance across, completed depth down (deeper is lower). Hover a dot for its values. The dashed line is the median. Records are shown by distance only; no locations are published.
Monthly average high and low temperature, Lethbridge County-15300 °CJanFebMarAprMayJunJulAugSepOctNovDecJan: average high 2.5 °C, average low -6.3 °CJan: average high 2.5 °C, average low -6.3 °CFeb: average high 3.8 °C, average low -5.9 °CFeb: average high 3.8 °C, average low -5.9 °CMar: average high 7.8 °C, average low -3.7 °CMar: average high 7.8 °C, average low -3.7 °CApr: average high 11.5 °C, average low -1 °CApr: average high 11.5 °C, average low -1 °CMay: average high 20.7 °C, average low 8.1 °CMay: average high 20.7 °C, average low 8.1 °CJun: average high 19.3 °C, average low 9.3 °CJun: average high 19.3 °C, average low 9.3 °CJul: average high 28.7 °C, average low 14.7 °CJul: average high 28.7 °C, average low 14.7 °CAug: average high 25 °C, average low 12.1 °CAug: average high 25 °C, average low 12.1 °CSep: average high 19.2 °C, average low 8.1 °CSep: average high 19.2 °C, average low 8.1 °COct: average high 14 °C, average low 2.4 °COct: average high 14 °C, average low 2.4 °CNov: average high 6.7 °C, average low -2.4 °CNov: average high 6.7 °C, average low -2.4 °CDec: average high 0.8 °C, average low -11.3 °CDec: average high 0.8 °C, average low -11.3 °C28.7 °C-11.3 °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.
Monthly horizontal irradiance, Lethbridge County (kWh/m²/day)Jan: 1.2 kWh/m²/dayJFeb: 2.09 kWh/m²/dayFMar: 3.33 kWh/m²/dayMApr: 4.41 kWh/m²/dayAMay: 5.28 kWh/m²/dayMJun: 5.82 kWh/m²/dayJ5.82Jul: 5.92 kWh/m²/dayJAug: 5.06 kWh/m²/dayASep: 3.65 kWh/m²/daySOct: 2.26 kWh/m²/dayONov: 1.24 kWh/m²/dayNDec: 0.93 kWh/m²/dayD0.93
Horizontal irradiance by month from the report pipeline's insolation tables at the sample point. June and December are labelled; the ratio between them sizes an off-grid battery bank.

Provincial flood studies near the sample point: Oldman River. See how to read Alberta flood hazard maps.

Growing zones near Lethbridge County: Lethbridge (zone 4b) · Taber (zone 4a) · Cardston (zone 4b) · Claresholm (zone 4a) · Alberta growing zones map

Neighbouring counties: County of Warner (46 km) · MD of Taber (48 km) · Cardston County (66 km) · MD of Willow Creek (73 km) · Compare Lethbridge County with another county

Sampled from the live report pipeline at a representative quarter in Township 9, Range 21, W4 on 2026-10-08: well depth, hardiness zone, solar irradiance (49 well records within 5 km). Text reviewed 2026-10-08. Methodology.

Common questions

How deep are farm wells in Lethbridge County?

Nearby records point to roughly 93 m as a planning figure. Your parcel can differ a lot, so a pump test matters more than the county average.

How long is the growing season in Lethbridge County?

Plan around about 130 frost-free days, then check your own field for frost pockets and shorter windows.

Do I need approval to drain a wet field in Lethbridge County?

Often, when a wetland or watercourse is involved. Confirm with Alberta Environment and Protected Areas before you dig.

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