How Many Feet Per Mile Is Steep Hiking?

By Sarah Miller · February 6, 2044

For hiking, a grade of about 88 feet of elevation gain per mile (16.7 feet per 100 feet) is generally considered steep, equating to roughly a 15% incline. This means for every mile hiked, you ascend at least 880 feet to be classified as a steep trail.

Understanding Steepness in Hiking

When evaluating how steep a hiking trail is, elevation gain over distance is the primary factor. While there's no universally standardized definition, most outdoor experts and hikers agree that a sustained rise of around 800–1,000 feet per mile qualifies as steep. This translates into a vertical-to-horizontal ratio that significantly increases physical effort and difficulty.

What Makes a Trail Steep?

Elevation gain exceeding 800 feet per mile
Sustained incline over long distances
Terrain type (rocky, loose soil, uneven steps)
Trail surface conditions (wet, icy, root-covered)
Presence or absence of switchbacks

How Elevation Gain Defines Trail Difficulty

Hiking difficulty ratings often incorporate elevation gain alongside total distance. A short hike with high elevation gain can be more strenuous than a longer, flatter one. The following table shows common classifications used by park services and trail guides:

Terrain Type	Elevation Gain (ft/mile)	Incline Percentage	Difficulty Level
Flat/Easy	0–100	0–2%	Beginner
Rolling/Moderate	100–400	2–8%	Intermediate
Hilly/Challenging	400–800	8–15%	Advanced
Very Steep/Extreme	800–1,500+	15–28%+	Expert Only

Table data source:1, 2

The data shows that trails with over 800 feet of elevation gain per mile are consistently categorized as very steep and suitable only for experienced hikers. An incline above 15% dramatically increases cardiovascular and muscular demand, especially when carrying a backpack.

Factors That Influence Perceived Steepness

While numerical measurements provide objective benchmarks, several environmental and physiological factors affect how steep a trail feels:

Physical Condition and Fitness Level

A well-conditioned hiker may find a 15% grade manageable, while a beginner might struggle on a 10% slope. Cardiovascular endurance, leg strength, and prior altitude exposure play crucial roles.

Altitude and Oxygen Levels

At higher elevations, reduced oxygen makes any incline feel steeper. Trails above 8,000 feet can increase perceived exertion by up to 30%, even if the gradient remains unchanged.

Weather and Trail Conditions

Rain, snow, or mud reduce traction and force shorter, more frequent steps. Loose gravel or wet rocks amplify fatigue and make moderate grades feel extreme.

Pack Weight and Duration

Carrying a heavy backpack increases strain exponentially on uphill sections. A 20-pound pack on a 15% grade can double energy expenditure compared to hiking unencumbered.

Real-World Examples of Steep Hikes

Certain famous hikes exemplify what constitutes a steep ascent:

Mount Washington Carriage Road, NH: Averages 950 ft/mile over 7.6 miles, peaking at 1,200 ft/mile – one of the steepest maintained trails in the U.S.
Stairway to Heaven (Haiku Stairs), Oahu: Reaches gradients exceeding 45% in places, with over 3,900 steps climbing 2,800 feet in just 0.8 miles (~3,500 ft/mile).
Angels Landing, Zion National: Moderate overall but features sections with ~1,000 ft/mile equivalent during narrow ridgeline climbs.

Frequently Asked Questions About Steep Hiking

How many feet per mile is considered steep hiking?

A hike with 800 feet or more of elevation gain per mile is generally considered steep. This corresponds to an average incline of about 15%, which significantly increases physical effort and is typically rated as difficult or expert-level.

Is 10% incline steep for hiking?

Yes, a 10% incline (about 528 feet per mile) is moderately steep and can be challenging for beginners. It requires sustained effort and becomes particularly taxing over long durations or at high altitudes.

What is the steepest hiking trail in the United States?

The Haiku Stairs ('Stairway to Heaven') in Hawaii is among the steepest, with sections exceeding a 45% grade. Though currently closed due to safety concerns, it rises approximately 2,800 feet in under a mile, averaging over 3,500 feet per mile in some segments.

How do I train for steep hikes?

To prepare for steep terrain, focus on cardio conditioning (like stair climbing or hill repeats), build leg strength through squats and lunges, and practice with a weighted backpack. Gradually increase elevation gain during training hikes to improve stamina and acclimatization.

Does hiking steep trails burn more calories?

Yes, hiking steep trails burns significantly more calories—up to 50–100% more than flat terrain. A 160-lb person can burn 500–700 calories per hour on a 15% grade, depending on pace and load, compared to 300–400 on level ground.