Biking in National Parks: Car-Free Windows & E-Bike Rules

Biking is one of the most rewarding ways to experience national parks, offering car-free spring access on iconic mountain highways before motor vehicles are permitted. Under federal policy, Class 1 and Class 2 e-bikes are permitted on roads and paved multi-use paths wherever traditional bicycles are allowed.

Key takeaways

• Car-free spring cycling: Going-to-the-Sun Road (Glacier) allows non-motorized cycling past Avalanche Creek in May and June while snowplows clear high passes.
• Zion Canyon Scenic Drive: Vehicle-restricted for 9 months a year, making the 6-mile canyon route an extraordinary cycling corridor with views of the Virgin River and soaring sandstone walls.
• Crater Lake 'Ride the Rim': Annual vehicle-free cycling days in September opening 25 miles of East Rim Drive exclusively to non-motorized recreation.
• Federal E-bike rules: Class 1 (pedal-assist up to 20 mph) and Class 2 (throttle-assist up to 20 mph) e-bikes are allowed on public roads and paved bike paths; Class 3 (assist up to 28 mph) is generally prohibited.
• Trail restrictions: Bicycles and e-bikes are strictly banned on all hiking trails and backcountry wilderness areas designated under the Wilderness Act.

The premier car-free cycling experiences in the National Park System

Certain iconic park corridors offer seasonal windows where bicycles reign supreme without vehicle exhaust, RV blind spots, or bumper-to-bumper traffic:

• Glacier National Park — Going-to-the-Sun Road (May & June): In late spring, road crews plow the lower road to The Loop while Logan Pass remains snowbound. On weekends, the plowed road is open exclusively to hikers and cyclists. Pedaling 16 miles up alpine switchbacks along McDonald Creek is a world-class cycling bucket-list item.
• Zion National Park — Zion Canyon Scenic Drive (March–November): Because private cars are banned when the shuttle operates, the 6-mile dead-end canyon drive carries only occasional slow-moving shuttle buses. Bicyclists can pedal directly to trailheads like Angels Landing and The Narrows without waiting in shuttle lines.
• Crater Lake National Park — Ride the Rim (September): For two consecutive Saturdays in September, Crater Lake closes East Rim Drive to automobiles, creating a 25-mile car-free cycling circuit with 3,500 feet of climbing around the caldera rim.
• Great Smoky Mountains — Cades Cove (May–September): Every Wednesday from May through September, the 11-mile scenic loop is closed to motor vehicles until 4:00 p.m., allowing cyclists to tour historic homesteads and meadows in peace.

Understanding NPS e-bike classifications and rules

The Department of the Interior established an official e-bike regulation aligning federal recreation rules with state standards. Here is how e-bike classes are regulated across national parks:

• Class 1 E-Bikes: Equipped with a motor that provides assistance only when the rider pedals, ceasing assist at 20 mph. Permitted on all park roads and designated paved bike trails.
• Class 2 E-Bikes: Equipped with a throttle-actuated motor that ceases assist at 20 mph. Generally permitted on public roads and paved paths, though riders must adhere to 15 mph trail speed limits.
• Class 3 E-Bikes: Motor provides assist up to 28 mph. Because of elevated speeds, Class 3 e-bikes are restricted to public motor vehicle roadways only and are prohibited on multi-use shared paths.

Crucially, e-bikes cannot be ridden on non-motorized dirt hiking trails or within designated federal wilderness areas. Violating wilderness restrictions carries substantial federal fines.

Frequently asked questions

Do you need a helmet to bike in national parks?

NPS regulations strongly recommend helmets for all cyclists and mandate them for riders under 16 or 18 years of age depending on the governing state's bicycle helmet laws. High-visibility lights and clothing are essential in mountain tunnels.

Can you rent e-bikes in gateway towns?

Yes. Major gateway towns—including Springdale (Zion), West Glacier (Glacier), Moab (Arches/Canyonlands), and Estes Park (Rocky Mountain)—have numerous local outfitters offering daily e-bike rentals and shuttle drop-offs.

Are bikes allowed on national park shuttle buses?

Many park shuttles (including the Zion Canyon Shuttle, Acadia Island Explorer, and Bryce Canyon Shuttle) feature front-mounted bike racks accommodating two to three standard bicycles on a first-come, first-served basis.