| Fish Creek | Clearwater National Forest | 15.5 |
| Access into Fish, Willow, and Hungery Creeks, Obia Cabin and Frenchman Creek Road #5574. The trail is in good condition from the trailhead to Hungery Creek, fair condition from Hungery Creek to Ceabothus Creek, and unusable from there to Fish Creek Mea... |
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| Fish Creek Meadow | Clearwater National Forest | 6 |
| This trail provides access to Fish Creek Meadow from Boundary Peak Road #485. The trail has not been maintained for many years. The trail tread is in poor condition. The trail was cleared in 1997. |
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| Fish Lake | Targhee National Forest | 0.6 |
| Beginning at road #047 through Winegar Hole Wilderness to South Boundary trail, Yellowstone National Park. This route is easily followed, well maintained and signed. There is good fishing and camp spots. Camping permits are required in the Park. |
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| Flame Creek | Clearwater National Forest | 1 |
| This is an easy trail that drops down the ridge from the lookout ito a grove of Cedar trees that was missed by the large fires earlier in the century. Game trails are numerous, but the trail is blazed. Lookout renters and other Forest visitors have com... |
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| Flat Mountain | Clearwater National Forest | 2 |
| This is an easy hike through stands of hemlock and alpine fir. It provides access to several popular mountain lakes within 1-2 hours hike from the end of road 5297A. This is a good trail for families with small children who are capable of making short ... |
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| Fool Creek Trail | | |
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| Foolhen Way | | |
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| Footrot Corrals | Clearwater National Forest | 3.8 |
| A moderate hike, the trail descends into Hemlock Creek and then ascends to Lean-to ridge. The trail passes through heavily forested lodgepole pine stands and alpine meadows. Te trail is in poor condition with many steep, rutted sections that are brushy. |
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| Forty-Four Trail | | |
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| Fourmile Creek Trail | | |
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| Fox Creek | Targhee National Forest | 8 |
| This route passes through beautiful meadows fringed by aspen and fir. It borders clear streams, beaver ponds, and waterfalls. The Fox Creek Pass Area at the trail's end presents good camping and a spectacular view of the Teton Range. However, the trail... |
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| Frances Lake Trail | Eagle Cap Ranger District | 9.1 |
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| Freezeout Trail | | |
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| Frenchman Creek | Clearwater National Forest | 2.5 |
| Access to Fish Creek Trail from the Frenchman Butte Road spur off Middle Butte Road #483. This trail has been maintained to a low standard by sportsmen. It is located in brush fields and dense stands of conifers. The trail is not suitable for stock or ... |
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| Frog Peak | Clearwater National Forest | 7.6 |
| Moderate to difficult, the trail is brushy, rutted, rocky and steep. The section from Frog Peak Divide to Frog Lake is extremely steep and densely timbered. There are numerous high open areas and good vistas. |
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| Gabe's Peak Trail | Boise National Forest | 7 |
| The trail ascends to the top of West Mountain through conifers, meadows, and open ridge tops. The trail passes near Gabe's Bathtub and around Gabe's Peak and ends at Wilson Meadows near an old stockman's cabin. The trail is well defined, but is narrow ... |
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| Gabes Peak Trail | | |
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| Gable Creek Trail | | |
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| Game Creek | Targhee National Forest | 7 |
| The Game Creek Trail is tailored for the hiker in search of solitude. Particularly spectacular is the view from the trail's terminus at the Park Boundary where a Park trail leads down to Marion Lake. The trail begins at a watershed development at the e... |
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| Gant Ridge Trail | | |
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| Garden Creek Trail | | |
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| Garnet | Clearwater National Forest | 3.5 |
| Very unsafe for stock travel due to extensive slab rock in the trail tread. Hiks is somewhat difficult due to steepness of grade and poor trail tread. |
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| Gem County Stock Trail | | |
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| Giant Red Cedar | Clearwater National Forest | 0.2 |
| Rated easy, the trail is wide and well-maintained, introducing visitors to a wet draw bottom and an old-growth cedar stand. The largest tree is designated "Champion Tree of Idaho" (18 feet in diameter, 177 feet in height). Note the large cedar shattere... |
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| Glade Creek | Clearwater National Forest | 4 |
| Access To Dry Point and to Road #5542B from Highway 12. The lower portion of this trail is suitable for day hiking from Highway 12 although it has some areas where brush and logs are a problem. The trail is currently unsuitable for bike or stock use. T... |
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