As of 31 August, all US national parks have been given 30 days to implement new policies for ebikes, which have until now been prohibited on trails and bike paths in all national parks.
The gist of the new regulations are thus:
(1) Ebikes may be used on all park bike paths and trails which allow bicycles
(2) Ebikes may only be used on such paths and trails when the motor is being used to assist pedaling, not provide all motive power
(3) Ebikes are NOT allowed in wilderness areas or other areas off limits to bicycles
There are a few ambiguities in the new regulations. For example, all ebikes with motors under 750 watts (1 hp) are allowed, including class 1, 2, and 3. However, they must not be used without pedaling, even if the bike is capable of moving without pedaling.
Here’s a link to the National Park Service announcement, which also has a link to the actual directive issued to all national park superintendents.
Keep in mind that each individual park has 30 days to implement the new policy, so don’t rush to your favorite national park with your ebike until that park adjusts its rules.
PS: The new policies include Bureau of Land Management lands as well as national parks.