If you are aiming for Rocky Mountain National Park in September, the key date is Saturday, August 1, 2026, at 8 a.m. MDT. That is when Recreation.gov is scheduled to release timed-entry reservations for September 1 through September 30, plus any remaining August dates.
The practical rule is simple: decide whether Bear Lake Road is part of your trip before you book. A standard Timed Entry reservation covers most areas of the park outside the Bear Lake Road Corridor from 9 a.m. to 2 p.m. Timed Entry+ Bear Lake Road covers that popular corridor from 5 a.m. to 6 p.m. and also includes the rest of the park.
Both options use a two-hour entry window. Once you enter, there is no set departure time, but arriving after your window can mean being turned around and told to come back later. The reservation is for one vehicle, not each passenger, and a separate park entrance pass or fee is still required.
What to book first
Choose Timed Entry+ Bear Lake Road if your plan depends on Bear Lake, Glacier Gorge Trailhead, Sprague Lake, Moraine Park or the Park & Ride area. The National Park Service says visitors with that permit must enter the corridor during their assigned window; if they leave and want to return later, re-entry is allowed after 2 p.m.
Choose standard Timed Entry if your day is built around Trail Ridge Road, Alpine Visitor Center, the west side of the park, Wild Basin, Lily Lake or other areas outside Bear Lake Road. For most non-Bear Lake areas, visitors without a timed-entry reservation can enter before 9 a.m. or after 2 p.m.
What to check before checkout
The reservation fee is a non-refundable $2 Recreation.gov processing charge. Timed-entry reservations are not sold at park entrance stations or visitor centers, and Recreation.gov says they are non-transferable. The person named on the confirmation must be present in the vehicle and ready to show a photo ID.
Do not treat a timed-entry reservation as a parking reservation. Recreation.gov says it guarantees vehicle access on the specified day and window, not a space at Bear Lake or any particular trailhead. If your plan depends on a full parking area, have a second stop ready.
If the August 1 release is gone, there is still a narrow backup. Additional timed-entry reservations are released on Recreation.gov at 7 p.m. MDT the night before the desired arrival date, first come, first served. The park warns those can sell out quickly, so it is better to create or update your Recreation.gov account before the release time, not while inventory is moving.
Before leaving for the park, save the confirmation somewhere that does not depend on a weak signal. NPS advises printing it or taking a full screenshot that includes the date and QR code. Visitors heading to outlying areas during reservation hours may need to display a printed copy on the vehicle dashboard.
Bottom line
For a September Rocky Mountain trip, the lowest-friction plan is to pick your corridor first, set a reminder for 8 a.m. MDT on August 1, keep the 7 p.m. night-before release as a backup and remember that the timed-entry reservation is only one part of entry. You still need the park pass, the right two-hour window and a plan if parking is already full.
