26 official trails lie within 25 miles of Harlingen — 84 miles in total, 26 rated easy and 0 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 29 ft; the median trail gains 9 ft.
| Trail | Miles | Climb | Difficulty | Drive from town |
|---|---|---|---|---|
| Upper Cayo Loop | 17.2 | 25 ft | Easy | 55 min · 29 mi |
| Horse Island Trail | 3.7 | 27 ft | Easy | 1 h 10 min · 33 mi |
| Laguna Atascosa Loop | 10.6 | 22 ft | Easy | 56 min · 24 mi |
| Brownsville Historic Battlefield Trail | 1.6 | 29 ft | Easy | 28 min · 21 mi |
| West Rail Trail | 6.4 | 17 ft | Easy | 34 min · 26 mi |
| North Point Road Trail | 3.6 | 26 ft | Easy | 1 h 01 min · 29 mi |
| Moranco Blanco Trail | 1.7 | 19 ft | Easy | 49 min · 28 mi |
| South Boundary Trail | 2.9 | 17 ft | Easy | 42 min · 26 mi |
| Island Fields Loop | 3.1 | 13 ft | Easy | 52 min · 28 mi |
| Llano Grande Hiking Trail | 1.4 | 12 ft | Easy | 26 min · 20 mi |
| East Lake Tract G Rd | 1.1 | 18 ft | Easy | 46 min · 31 mi |
| Kidney Pond Trail | 2.5 | 9 ft | Easy | 48 min · 28 mi |
| Southmost Nature Trail | 1.7 | 8 ft | Easy | 34 min · 26 mi |
| Adolph Thomae Trail | 2.1 | 8 ft | Easy | 1 h 00 min · 28 mi |
| Whitetail Trail | 4.0 | 7 ft | Easy | 36 min · 21 mi |
| Scum Pond Trail | 1.9 | 7 ft | Easy | 38 min · 23 mi |
| Bobcat Lane | 1.1 | 6 ft | Easy | 37 min · 22 mi |
| Yellowthroat Loop | 1.1 | 6 ft | Easy | 37 min · 22 mi |
| Quail Loop | 1.4 | 6 ft | Easy | 38 min · 26 mi |
| Mesquite Trail | 1.1 | 4 ft | Easy | 46 min · 27 mi |
| Wader's Trail | 1.1 | 3 ft | Easy | 26 min · 20 mi |
| Flycatcher Trail | 1.2 | 3 ft | Easy | 37 min · 20 mi |
| Ibis Trail | 1.2 | 2 ft | Easy | 44 min · 26 mi |
Summits: Moranco Blanco Trail to Moranco Blanco
Lakes: Laguna Atascosa Loop to Laguna Atascosa; West Rail Trail to Salt Pond; Llano Grande Hiking Trail to Llano Grande Lake; Wader's Trail to Llano Grande Lake
Nearby towns: Brownsville (20 mi)
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