Alberta Long-Term Soil Moisture Trends: Government Statistics and Data Sources

Executive Summary

Alberta's soil moisture record shows a province characterized by high natural variability, punctuated by major drought episodes, but with a pronounced drying trend since the early 2000s that has accelerated in the 2020s. Government data from Alberta Agriculture and Irrigation, the Alberta Climate Information Service (ACIS), and Agriculture and Agri-Food Canada (AAFC) consistently document that large portions of the province are now experiencing soil moisture deficits that rank among the worst in the 50-to-65-year instrumental record. The underlying driver is not simply reduced precipitation, but increasing evapotranspiration from rising temperatures—a dynamic that is expected to deepen soil moisture deficits province-wide throughout the 21st century.

Primary Data Sources and Monitoring Infrastructure

Alberta Climate Information Service (ACIS)

The Government of Alberta's primary soil moisture tracking system is the Alberta Climate Information Service (ACIS), a network of more than 350 automated weather stations that report near real-time conditions across the province. The ACIS Historical Weather Data Viewer provides interpolated daily meteorological records for 6,900 geographic points going back to 1961, allowing users to view, graph, or download soil moisture data as a percentage of field capacity, alongside precipitation, temperature, and drought index layers. Soil temperature is monitored at four depths, and soil moisture comparisons against long-term averages can be queried for any period within the archive. The portal is publicly accessible at acis.alberta.ca.[1][2]

Alberta Agriculture and Irrigation — Agricultural Moisture Situation Updates

Alberta Agriculture and Irrigation publishes Agricultural Moisture Situation Updates, produced by the provincial drought modelling team. These are released frequently during the growing season and periodically in winter months. The reports compile modelled root-zone soil moisture reserves (to a depth of 120 cm), precipitation accumulations at rolling time intervals (30, 60, 90, 180, and 365 days), and comparisons against the 1991–2020 long-term average. Conditions are expressed in return-period language: "once in 3 to 6-year lows," "once in 12 to 25-year lows," and "once in 25 to 50-year lows" or "driest on record."[3][4]

Agriculture and Agri-Food Canada (AAFC)

AAFC publishes satellite-derived soil moisture maps using passive microwave data from the Soil Moisture and Ocean Salinity (SMOS) satellite, providing weekly, bi-weekly, and monthly volumetric soil moisture anomalies (percent saturation, top 5 cm) relative to a long-term average, downloadable through the federal Open Data portal. AAFC also maintains a Maps of Historic Agroclimate Conditions portal covering soil moisture via the Palmer Drought Index (PDI), Standardized Precipitation Index (SPI), and Standardized Precipitation Evapotranspiration Index (SPEI) from 2006 onward, with rolling windows from 7 days to 5 years.[5][6][7]

Key Drought Episodes and Benchmark Soil Moisture Statistics

Early Instrumental Era: Major Droughts of the 20th Century

Historical climatological analysis using the Standardized Precipitation Index and Palmer Drought Severity Index identifies the drought years of 1919–21, 1929–31, and 1936–37 as the most severe in the southeastern Alberta and southwestern Saskatchewan records—deeply embedded in the collective agricultural memory of the Prairies. The 1988 drought was another landmark event, establishing a modern benchmark against which subsequent droughts are measured.[8][9]

2001–2002: The Benchmark Modern Drought

The 2001/2002 drought is the most intensively studied modern drought on the Canadian Prairies. Statistical analysis confirms it was one of the worst and most prolonged droughts in the period of instrumental records. In 2001, drought conditions that had developed in southern Alberta since fall 1999 spread northward into central Alberta and eastward through south-central Saskatchewan. Soil moisture reserves fell below 50 mm of plant-available water across most of south-central and east-central Alberta, stretching as far north as the County of St. Paul, with pockets appearing in the Counties of Ponoka and Lacombe and Special Areas 2, 3, and 4. Southern Alberta—already prone to dry growing conditions with drought occurring "about once every four or five years"—experienced catastrophic crop losses.[10][9][11][12]

2009–2010: Sub-soil Deficits

Following the 2001 drought, sub-normal precipitation years continued to stress soil reserves periodically. Alberta Agriculture and Rural Development documented that in spring 2010, sub-soil moisture conditions were very low in many parts of the agricultural regions, with soil moisture in the central and western North region and western Central Region falling to once-in-12 to once-in-25 year lows. Timely, much-above-normal winter and early spring precipitation was identified as critical to restore near-normal levels.[13]

2020–2023: A Four-Year "Once in 50-Year" Event

The most statistically extreme multi-year soil moisture deficit on record for Alberta's modern era occurred from 2020 to 2023. Ralph Wright, manager of the Province's Agro-meteorology Applications and Modelling Unit, confirmed that areas from Calgary to Red Deer and up to Whitecourt suffered once-in-50-year lows for a four-year consecutive period, with the same applying in the northeast and Peace Region. Over this period, Red Deer lost approximately 400 millimetres of cumulative moisture deficit, while the southeast and southwest corners were down 500 to 600 millimetres below normal. The last "wet year" sufficient to replenish surface water supplies—rivers, lakes, wetlands, dugouts, and soil moisture—was 2016.[14]

In 2023, water volumes for the Battle River hovered around the 5th percentile, representing very low flows that occur on average once every 20 years. Snowpack at some monitoring stations, such as Bigstone, recorded snow-water equivalents of 27 mm compared to a historical average of 69 mm—ranking as the third lowest snowpack in over 50 years. By early 2024, drought conditions in the Battle River and Sounding Creek watersheds reached Severe (D2) to Extreme (D3) classification, with Special Areas categorized as Exceptional (D4).[15]

2023–2024: El Niño Compounding Effect

The 2023–2024 El Niño event dramatically worsened an already depleted moisture base. Alberta Agriculture and Irrigation's January 2024 Moisture Situation Update reported that winter precipitation since November 1, 2023, placed most lands between Grande Prairie and Ponoka at once-in-50-year lows for winter precipitation accumulation. In the driest parts of the northwest and northeast regions, totals represented less than 10 per cent of the 1991–2020 average. Temperatures across the northern half of the province were warm at a frequency of less than once in 50 years, accelerating evaporation from what little moisture existed. By the following growing season, approximately 98 per cent of the Prairie agricultural region was in some stage of drought.[16][17][18]

2024–2025: Partial Recovery

The 2024 growing season brought highly variable conditions. Heavy May 2024 precipitation provided relief to parts of the province, but large areas in the North Half—especially north of Edmonton—received far less. By October 2024, the Battle River Watershed showed soil moisture reserves at near normal in parts of the Sounding Creek watershed, while central and eastern zones continued to show very low to extremely low anomalies occurring once in 25 to 50 years over the four-year cumulative period. By late December 2024, all five subwatersheds of the Battle River Basin were in Stage 4 Extreme Drought, the most severe classification in Alberta's Drought Response Plan, a status that had been triggered continuously since May 31, 2023.[19][14][15]

Entering winter 2025–2026, cold season precipitation relative to long-term normal improved to near-normal across much of the Battle River and Sounding Creek watersheds, though overall precipitation accumulations over the prior year remained moderately to very low across the region, with some parts of Camrose County, Flagstaff County, MD of Wainwright, and MD of Provost at extremely low levels. As of February 2026, the Battle River Basin was classified as Stage 1 Abnormally Dry.[19]

Regional Breakdown of Soil Moisture Conditions

Region	Recent Trend	Notable Statistics
Central Alberta (Red Deer area)	Severe long-term deficit	Once-in-25-year lows persisted 2022–2024; 400 mm cumulative deficit 2020–2023[20][14]
South & Southeast Alberta	Chronically dry with periodic relief	Once-in-50-year lows 2020–2023; 500–600 mm cumulative deficit[14]; 98% Prairie ag region in drought in 2024[16]
Northeast Alberta	Extended multi-year drought	Once-in-50-year winter precipitation 2023–24; consistently below normal since 2020[17]
Northwest / Peace Region	High variability; western areas drier	Once-in-25-year to once-in-50-year lows during 2023–24 El Niño; northwest areas reporting < 10% of normal winter precip[17]
Southern Peace / High Prairie / Slave Lake	Near-normal or above-normal pockets	Remained relatively wetter than surroundings in 2024–2025[14]
Southwest Alberta (foothills/mountains)	Snowpack-dependent; variable	Spionkop Creek and Gardiner Headwaters headwaters above 30-year average by early 2024[21]

Long-Term Structural Drivers: Climate Change and Evapotranspiration

The Government of Alberta's scientific literature consistently identifies increasing evapotranspiration driven by warming temperatures as the primary structural force behind long-term soil moisture decline, distinct from precipitation variability alone.[22][23]

The Climate Moisture Index (CMI), an integrated measure of available moisture accounting for both precipitation and evapotranspiration losses, shows a clear long-term drying signal. Climate modelling conducted for the Alberta Biodiversity Monitoring Institute (ABMI) projects that Alberta's CMI will decline from a historical norm of 5.9 cm to -5.1 cm under a high-emissions scenario (A2) and to -0.6 cm under a lower-emissions scenario (B1). A negative CMI indicates a moisture deficit—where evaporative demand exceeds precipitation supply. Key mechanisms driving this shift include:[23][24]

• Increased evapotranspiration: Warmer temperatures drive higher moisture loss from soils and vegetation, overwhelming precipitation increases[22][23]
• Shorter snow cover duration: Earlier spring melt triggers ground warming sooner, lengthening the period of evaporative moisture loss before summer rains arrive[25][23][22]
• Reduced midsummer precipitation: While annual totals may rise slightly, precipitation during July and August—when crop and soil moisture stress is highest—is projected to decline[23][22]
• Increased drought frequency and severity: Climate change is projected to substantially increase the frequency, severity, and duration of summer droughts in the southern Prairies and interior of British Columbia by end-of-century[26]

For northern Alberta's reconstructed watersheds (Fort McMurray region), modelling studies project that while maximum soil moisture deficits may decrease under high-emissions scenarios due to increased annual precipitation, actual evapotranspiration increases will place significant stress on water balance.[27]

Prairie Wetlands and Groundwater Implications

Declining soil moisture reserves have downstream ecological consequences. Under a warmer, drier climate trajectory, prairie wetlands will experience reduced runoff and groundwater flows, increased evaporative losses from earlier spring melt, declining average water levels, and longer periods of seasonal dryness. The Battle River's flows at multiple monitoring stations fell to zero cubic meters per second at several locations in mid-2024—conditions that triggered fish kills and stranded aquatic fauna. The province's rivers.alberta.ca monitoring system documented the Battle River upstream of Ponoka at 0.00 cms in late October 2024. Sustained, well-above-average moisture is needed to recharge groundwater reserves beyond surface soil, as years like 2016—the last truly "wet year"—have not recurred in nearly a decade.[14][15][23]

How to Access Alberta Government Soil Moisture Data

Resource	Description	Access
ACIS Historical Weather Data Viewer	Interpolated daily records from 1961 to present for 6,900 provincial points; downloadable CSV[2]	acis.alberta.ca
Agricultural Moisture Situation Updates	Government of Alberta drought team reports with modelled root-zone soil moisture maps[3][4]	open.alberta.ca (search "soil moisture")
Alberta Soil Information Viewer	GIS-based soil data for agricultural region[28][29]	alberta.ca
AAFC Satellite Soil Moisture (SMOS)	Weekly/bi-weekly/monthly volumetric surface moisture anomaly maps[5][6]	agriculture.canada.ca
AAFC Historic Agroclimate Maps	Palmer Drought Index (PDI), SPI, SPEI; 7-day to 5-year rolling windows, 2006–present[7]	agr.gc.ca/DW-GS
NASA ORNL DAAC	Hourly in-situ soil moisture logger data from Red Earth Creek, Alberta (2017–2021)[30]	earthdata.nasa.gov

Conclusions

Alberta's long-term soil moisture record reveals a province whose natural drought variability is being amplified by climate warming. The 2020–2023 period stands as the most severe multi-year soil moisture deficit in the modern instrumental record for large parts of central, northeast, and Peace Region Alberta, with cumulative deficits approaching once-in-50-year events that proved too deep for normal wet seasons to reverse. The ACIS network and Alberta Agriculture's moisture modelling infrastructure provide robust data going back to 1961, and these datasets confirm that soil moisture deficits are increasingly driven by evapotranspiration losses rather than precipitation alone—a structural trend aligned with projected Climate Moisture Index declines across almost all climate model scenarios. Researchers, watershed managers, and agricultural producers can access continuous historical data, current condition maps, and future trajectory projections through the government portals listed above.[24][2][16][14][23]

References

• Using the Alberta Climate Information Service - “Soil moisture and temperatures are useful in predicting when soils should be ready to start seeding...
• ACIS – Find historic climate data | Alberta.ca - Users can investigate historical trends and climate variability for most locations in the province. ...
• soil moisture - Open Government program - The Agricultural Moisture Situation Update is developed by the drought modelling team and published ...
• publications - Open Government program - The Agricultural Moisture Situation Update is developed by the drought modelling team and published ...
• Satellite Soil Moisture - agriculture.canada.ca - The following maps and data show levels of moisture in the top five centimeters of soil in Canada on...
• Satellite Soil Moisture - agriculture.canada.ca - 2013-14 Departmental Performance Report 2013–14 Departmental Performance Report. Sub-Program 2.3.2: ...
• Maps of historic agroclimate conditions - Agricultural production tools and data · Environment and sustainability ... Soil Moisture / Palmer D...
• [PDF] Canadian Prairie Drought: A Climatological Assessment - The drought years of 1919–21, 1929–31, and 1936–37 have been well identified, especially in southeas...
• [PDF] The western Canadian drought of 2001 – how dry was it?
• Historical comparison of the 2001/2002 drought in the Canadian ... - Agricultural drought indices relate to soil moisture availability and include for example, the Crop ...
• [PDF] Drought Report for the Agricultural Region of Alberta
• Historical comparison of the 2001/2002 drought in the Canadian ... - Over the west-central Canadian Prairies, precipitation was well below normal for a remarkable 8 cons...
• Government of Alberta PowerPoint Presentations
• SOIL SITUATION VARIES - If you like to read soil moisture maps in bed (and who doesn’t?), the latest of these may keep you u...
• Drought Update - BRWA - Battle River Watershed Alliance
• Alberta drought conditions expected to improve heading into 2025 - In 2024, it was a roller-coaster of a growing season for Alberta farmers. While some challenges stil...
• Moisture needed in Alberta, as El Niño impacts province - Top Crop Manager - Alberta Agriculture and Irrigation released its moisture situation update Jan. 3, and El Niño is cer...
• Moisture needed in Alberta, as El Niño impacts province - Potatoes in Canada - Alberta Agriculture and Irrigation released its moisture situation update Jan. 3, and El Niño is cer...
• Drought Update - BRWA - Battle River Watershed Alliance - Learn about current river flows, soil moisture, and precipitation conditions in the Battle River and...
• Moisture Situation Update – and the Alberta Climate Information ... - Alberta Lamb Producers is a dynamic partner in building a sustainable, thriving industry for sheep p...
• Moisture Update - March 24, 2024 | Saddle Hills County
• This publication may be reproduced in whole or in part and in any form for educational, data collection or non-profit purposes without special permission from the authors or ABMI, provided acknowledgement of the source is made. No use of this publication may be made for resale without prior permission in writing from the ABMI
• Alberta's Natural Subregions Under a Changing Climate: Past, Present, and Future
• Alberta’s Natural Subregions
• Richard R. Schneider
• Climate change and drought in Canada - Climate change will increase the risk and severity of droughts in Canada that already struggle with ...
• Impacts of climate change on soil moisture and evapotranspiration in reconstructed watersheds in northern Alberta, Canada - ## Abstract

This study aims at developing a generalized understanding of the sensitivity of soil mo...

• Alberta Soil Information Viewer - Alberta Soil Information Viewer. Use this online, map-based decision-support tool to access selected...
• Alberta soil information and data - Download the Agricultural Regions of Alberta Soil Information Database and search soil landscape and...
• Hourly Soil Moisture Logger Data, Alberta and Alaska, 2017-2021 | NASA Earthdata - Hourly Soil Moisture Logger Data, Alberta and Alaska, 2017-2021