82 official trails lie within 25 miles of O'Fallon — 205 miles in total, 66 rated easy and 3 hard or expert. Every distance and elevation figure below is computed from the agency centerline and a 10 m elevation model, not crowd-sourced.
The biggest climb nearby gains 350 ft; the median trail gains 170 ft.
| Trail | Miles | Climb | Difficulty | From town |
|---|---|---|---|---|
| Cuivre River Trail | 8.6 | 199 ft | Hard | 21 mi |
| Lost Valley Trail | 10.9 | 263 ft | Hard | 9 mi |
| Lewis and Clark Trail | 8.0 | 193 ft | Hard | 6 mi |
| Grotpeter Trail | 5.6 | 230 ft | Moderate | 18 mi |
| Lone Spring Trail | 5.9 | 135 ft | Moderate | 23 mi |
| Red Trail | 5.0 | 277 ft | Moderate | 21 mi |
| Green Rock Trail | 3.1 | 292 ft | Moderate | 15 mi |
| Fox Run Trail | 3.6 | 277 ft | Moderate | 17 mi |
| Hamburg Hiking And Biking Trail | 6.6 | 212 ft | Moderate | 6 mi |
| Equestrian Trail | 4.0 | 284 ft | Moderate | 12 mi |
| Greenrock Trail | 2.4 | 339 ft | Moderate | 19 mi |
| Big Sugar Creek Trail | 3.2 | 170 ft | Moderate | 22 mi |
| Labarque Hills Trail | 3.3 | 350 ft | Moderate | 24 mi |
| Rock Quarry Trail | 2.2 | 236 ft | Moderate | 15 mi |
| Yellow Trail | 3.3 | 288 ft | Moderate | 21 mi |
| White Bison Trail | 2.9 | 147 ft | Moderate | 20 mi |
| Round House Loop Trail | 2.6 | 313 ft | Easy | 18 mi |
| Lime Kiln Loop | 2.8 | 303 ft | Easy | 16 mi |
| River Scene Trail | 3.6 | 233 ft | Easy | 19 mi |
| Lakeside Trail | 3.6 | 95 ft | Easy | 20 mi |
| Unnamed trail | 2.3 | 286 ft | Easy | 25 mi |
| Maston Hill Loop Trail | 3.3 | 237 ft | Easy | 12 mi |
| Busch Greenway Hiking And Biking Trail | 3.7 | 195 ft | Easy | 6 mi |
| Dogwood Ridge Trail | 1.9 | 195 ft | Easy | 21 mi |
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