Quick answer
Yes, for most visitors: a 10.3 CAD conservation fee per adult per day covers roughly 1,500 square kilometres of Laurentian lakes, waterfalls and trails, with gates opening at 09:30 daily. The caveat is capacity — the Diable sector fills on warm weekends, and arriving between 09:30 and 11:00 is what separates a good day from a parking hunt.
Parc national du Mont-Tremblant was protected in 1895, which makes it the oldest national park in Québec and older than most of the roads that now reach it. That longevity explains its shape: roughly 1,500 square kilometres of Laurentian plateau, some 400 lakes and streams, and six rivers, all managed today by Sépaq rather than by the ski resort that shares the name. Anyone asking is mont tremblant worth visiting is usually weighing two different places at once — a pedestrian resort village, and a wilderness reserve half an hour north of it.
The park itself divides into sectors, and that distinction matters more than any single trail name. The Diable sector, entered from Lac-Supérieur, holds Lac Monroe, the Rivière du Diable and the two lookouts most day visitors come for, La Roche and La Corniche. The Pimbina sector, further east, is quieter and carries the Chute aux Rats, a stepped waterfall that photographs well in low autumn light. Between them run mixed boreal and hardwood forest, resident moose, black bear and loons, and a canoe route down the Diable that operators shuttle through the warm months. A visitor who books a Parc national du Mont-Tremblant tour from Montréal will usually be taken to the first of these.
The honest qualification is access. Entry is day-use and capacity-controlled, which means the reserve can restrict new arrivals once parking fills, and it does so on warm Saturdays and through the foliage weeks of late September and early October. Nothing about this landscape rewards a late start. Visitors who treat the drive as the first hour of the day, rather than a detour after brunch in the village, consistently report the better experience. Those who arrive expecting cafés, lifts and shops have generally come to the wrong Mont-Tremblant — the village handles that side, and the park does not pretend to.
So the practical answer to is mont tremblant worth visiting depends less on the destination than on the plan attached to it. Readers weighing a Laurentians day trip will find the timing, the conservation fee, road access from Highway 117 and the trail choices set out in the sections below, each built around a single day pass rather than a bundle. Judged as a half-day stop between other errands, the park underdelivers. Judged as the whole day, with an early gate time and one sector chosen deliberately, it holds up against anything else within two hours of Montréal.