Montana Level 4 Ecoregions Map
| er15a - Grave Creek Range-Nine Mile Divide |
| er15b - Camas Valley |
| er15c - Flathead Valley |
| er15d - Tobacco Plains |
| er15e - Flathead Hills and Mountains |
| er15h - High Northern Rockies |
| er15i - Clearwater Mountains and Breaks |
| er15k - Clark Fork Valley and Mountains |
| er15l - Salish Mountains |
| er15o - Coeur d Alene Metasedimentary Zone |
| er15p - St. Joe Schist-Gneiss Zone |
| er15q - Purcell-Cabinet-North Bitterroot Mountains |
| er15t - Stillwater-Swan Wooded Valley |
| er16a - Eastern Batholith |
| er16b - Lochsa Uplands |
| er16e - Glaciated Bitterroot Mountains and Canyons |
| er16h - High Idaho Batholith |
| er16i - South Clearwater Forested Mountains |
| er17aa - Dry Intermontane Sagebrush Valleys |
| er17ab - Dry Gneissic-Schistose-Volcanic Hills | er17ab - Big Hole |
| er17ad - Western Beaverhead Mountains | er17ad - Forested Beaverhead Mountains |
| er17af - Centennial Basin | er17af - Pioneer-Anaconda Ranges |
| er17ah - Eastern Pioneer Sedimentary Mountains | er17ah - Elkhorn Mountains-Boulder Batholith |
| er17aj - Eastern Divide Mountains | er17aj - Deer Lodge-Philipsburg-Avon Grassy Intermontane Hills and Valleys |
| er17al - Southern Garnet Sedimentary-Volcanic Mountains | er17al - Flint Creek-Anaconda Mountains |
| er17ao - Absaroka Volcanic Subalpine Zone | er17ao - Sedimentary Subalpine Zone |
| er17d - Eastern Gravelly Mountains | er17d - Barren Mountains |
| er17f - Crazy Mountains | er17f - Mid-elevation Sedimentary Mountains |
| er17h - High Elevation Rockland Alpine Zone | er17h - Absaroka-Gallatin Volcanic Mountains |
| er17j - Yellowstone Plateau | er17j - Granitic Subalpine Zone |
| er17l - Gneissic-Schistose Forested Mountains | er17l - Dry Mid-elevation Sedimentary Mountains |
| er17p - Foothill Potholes | er17p - Big Snowy-Little Belt Carbonate Mountains |
| er17r - Scattered Eastern Igneous-Core Mountains | er17r - Bitterroot-Frenchtown Valley |
| er17t - Limy Foothill Savanna | er17t - Paradise Valley |
| er17v - Big Belt Forested Highlands | er17v - Townsend Basin |
| er17x - Rattlesnake-Blackfoot-South Swan-Northern Garnet-Sapphire Mountains | er17x - Townsend-Horseshoe-London Sedimentary Hills |
| er17z - Tobacco Root Mountains | er17z - Bighorn Basin |
| er41a - Northern Front | er41a - Crestal Alpine-Subalpine Zone |
| er41c - Western Canadian Rockies | er41c - Southern Carbonate Front |
| er41e - Flathead Thrust Faulted Carbonate-Rich Mountains | er41e - Collapsed Glacial Outwash |
| er42d - Northern Missouri Coteau | er42d - Glaciated Dark Brown Prairie |
| er42j - Glaciated Northern Grasslands | er42j - Coteau Lakes Upland |
| er42l - Sweetgrass Uplands | er42l - Cherry Patch Moraines |
| er42n - Milk River Pothole Upland | er42n - North Central Brown Glaciated Plains |
| er42q - Rocky Mountain Front Foothill Potholes | er42q - Foothill Grassland |
| er43a - Missouri Plateau | er43a - Little Missouri Badlands |
| er43c - River Breaks | er43c - Forested Buttes |
| er43e - Sagebrush Steppe | er43e - Semiarid Pierre Shale Plains |
| er43k - Dense Clay Prairie | er43k - Missouri Breaks Woodland-Scrubland |
| er43m - Judith Basin Grassland | er43m - Central Grassland |
| er43o - Unglaciated Montana High Plains | er43o - Ponderosa Pine Forest-Savanna Hills |
| er43q - Mesic Dissected Plains | er43q - Non-calcareous foothill grassland |
| er43t - Shield-Smith Valleys | er43t - Limy Foothill Grassland |
| er43v - Pryor - Bighorn Foothills |
Based on Ecoregions developed by the EPA this map describe areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources, as well as similarity of climate that can assist Montana gardenders.
