A spur trail is a short side trail branching off a main trail, usually leading to a specific feature — a viewpoint, water source, campsite, or summit — and then dead-ending. Hikers take a spur out and back to reach the feature, then return to the main trail to continue.
A blowdown is a tree or large branch that has fallen across a trail, usually from wind, storms, or disease. Blowdowns force hikers to climb over, crawl under, or detour around them, and a trail thick with blowdown after a storm can dramatically slow progress until crews clear it.
The alpine zone is the ecological region above treeline, where harsh cold, wind, and short summers allow only low-growing, fragile plants like grasses, sedges, and cushion plants. It offers stunning open terrain but is highly sensitive — hikers stay on rock or trail to avoid trampling vegetation that takes decades to recover.
Treeline (or timberline) is the elevation above which trees can no longer grow, due to cold, wind, and a short growing season. Above treeline the landscape becomes open alpine terrain — more exposed to weather, harder to navigate, and ecologically fragile — so hikers take extra care there.
A ridge is a long, narrow elevated crest of land where two slopes meet, running between or up to summits. Ridge hiking offers expansive views and a natural line of travel, but exposed ridges catch wind and weather and can involve scrambling, making them exhilarating but sometimes serious terrain.
A saddle is a low point on a ridge between two higher summits, shaped like a horse's saddle. Also called a col or pass, saddles are natural places for trails to cross a ridge and often mark the low point between two peaks on a traverse. Their shape can also funnel and accelerate wind.
A false summit is a high point on a mountain that looks like the top when viewed from below but turns out to have more climbing beyond it. False summits are notorious for sapping morale and energy on long ascents, as hikers crest them expecting the top only to see the true summit still ahead.
A double blaze is two trail blazes placed close together to warn hikers of an upcoming turn, junction, or route change. Often the upper blaze is offset toward the direction of the turn. Spotting a double blaze is a cue to slow down and confirm where the trail goes.
A trailhead is the starting point of a trail, where it meets a road, parking area, or another trail. Trailheads often have signage, maps, parking, and registers, and are where hikes begin and end. Knowing the trailhead and any permits or fees is part of planning a hike.
A summit is the highest point of a mountain or hill — the top, and the goal of many hikes and climbs. Reaching the summit is called 'summiting' or 'bagging' a peak. A false summit is a high point that looks like the top from below but isn't, a common morale-tester on big climbs.