| Cady Ridge Trail | Wenatchee National Forest | 6 |
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| Calamity Peak Trail | | |
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| Cameron Creek | Olympic National Park | |
| The Cameron Creek Trail leads eleven miles southwestward from Gray Wolf River to Cameron Pass. It ascends 4,000 feet to the high point on Cameron Pass. |
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| Camp Creek Falls Trail | Gifford Pinchot National Forest | 0.3 |
| The trail climbs through a mixed coniferhardwood forest, continues along a steep side slope before ending within 20 feet of the waterfall. |
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| Camp Muir | Mount Rainier National Park | |
| This trail leads north from the Paradise Ranger Station to Camp Muir. It gains 4,600 feet in four and a half miles and should not be attempted in overcast conditions. |
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| Canteen Trail | | |
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| Canyon Creek Hoh Trail | | |
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| Canyon Creek Trail | | |
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| Canyon Lake Trail #720 | Mt. Baker-Snoqualmie National Forest | 3.1 |
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| Canyon Lake Trail #797 | Mt. Baker-Snoqualmie National Forest | 6 |
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| Canyon Ridge Trail | Mt. Baker-Snoqualmie National Forest | 10.3 |
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| Cape Alava-Sand Point Loop | Olympic National Park | 9.3 |
| NPS trail for foot travel. Receives high use. Both the Ozette-Cape Alava and the Ozette-Sand Point trails are puncheon boardwalks the majority of the distance. They are relatively flat and dry. They go through coastal forests and open areas of cedar sn... |
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| Carbon Glacier | Mount Rainier National Park | |
| This trail leads three miles south to Carbon River Camp and five miles one way to Moraine Park. It provides spectacular scenery in the little-used forest north of Mt. Rainier. |
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| Carbon Trail | Mt. Baker-Snoqualmie National Forest | 9.4 |
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| Carlton Creek Trail | Gifford Pinchot National Forest | 4 |
| This trail begins near the end of Road 44 and follows Carlton Creek upstream. The trail advances through dense oldgrowth forest until ending at the junction with the PCT. Sections of this trail have drainage problems which make horse travel difficult. ... |
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| Carlton Pasture Trail, #930 | Rogue River-Siskiyou National Forest | |
| This challenging 1.6-mile trail switchbacks through a mixed conifer and hardwood forest. Look out for old-growth madrone trees along the route. The path spills into a small meadow dotted with trees and remnants of an old mining shelter called Carlton P... |
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| Carne Mountain Trail | Wenatchee National Forest | |
| Carne Mountain Trail has moderate to steep grades through open forests leading to a small mountain basin. |
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| Cascade Crest Trail | | |
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| Cascade Pass | North Cascades National Park | |
| This trail leads eight miles from the Stehekin River Valley over Cascade Pass into the Cascade River Valley. |
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| Castle Lake Trail | Gifford Pinchot National Forest | 4 |
| Castle Lake Trail receives low use and features volcanic landscapes and water. |
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| Castle Mountain Trail | | |
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| Castle Ridge Trail | Gifford Pinchot National Forest | 2 |
| Castle Ridge Trail receives low use and features forested paths, high country views, and volcanic landscapes. |
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| Castle Rock Truck Trail | | |
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| Cathedral Driveway | | |
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| Cathedral Driveway Trail | Okanogan National Forest | 2 |
| Trail goes from Chewuch trailhead northwest down to Windy Creek trial #362 and further down the Cathedral Driveway trail is Chewuch trail #510. Trail is steep in some areas. |
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