Rocky Mountain National Park To Require Reservations Starting In May Mar.31.2021 Rocky Mountain National Park, which sits just outside Estes Park, Colorado, is one of the countryâs most popular -- and as a result, most crowded -- national parks. Various park officials met with the Estes Park town board earlier this week to explain that the park will require reservations this summer as a means to ease crowding and subsequent congestion. Although nothing has been officially announced, the park plans to implement a two-tiered timed-entry reservation system this year from May 28 to October 11, reports the Loveland Reporter-Herald. The first type of reservation will be for the enormously popular Bear Lake Road Corridor (BLRC), while the other reservation will only allow access to the rest of the park, the