The normal start is Rifugio Auronzo at 2,320 m, reached by a private toll road from Misurina (car toll roughly 30 EUR, paid per vehicle; in peak weeks a reservation system can apply, check the current rules before you drive). A seasonal bus also runs up from Misurina and Dobbiaco if you would rather skip the parking scramble. Just before the toll gate, roadside Lago Antorno mirrors the Tre Cime for a free warm-up photo.
The road opens when the snow clears, normally June to October. Outside those months the plateau is winter terrain.