Getting there
The C-8 Cercanías runs from Atocha and Chamartín to Cercedilla, the sierra’s trailhead town, in about 75 minutes. There the little C-9 mountain line takes over — weekends and holidays year-round — climbing through the pines to Puerto de Navacerrada and on to Cotos at 1,800 m, the highest railway station in the region.
The bus alternative is the 691 from Moncloa to Navacerrada village and pass. Either way, weekend morning departures fill fast: be early, especially on snow weekends.
The walking
From Cercedilla, the Fuenfría valley is the classic: a glacier-cut bowl of pines threaded by an actual Roman road — the Calzada Romana’s worn slabs climb to the pass the legions used. Signed loops of 2–4 hours leave from the valley information point; the miradores balcony path is the best effort-to-view ratio in the sierra.
From the Navacerrada pass, the Camino Schmidt traverses to Cercedilla in 3.5 shaded hours — the connoisseur’s line, yellow dots through the pines. From Cotos, the steady signed climb to Peñalara (2,428 m, the region’s roof) or the gentle Laguna Grande circuit both start at the station café.
Lunch, and whether to stay
The sierra’s reward system is the asador: judiones (giant white beans), cordero from the wood oven and a fireplace in Navacerrada village, or trailhead menús back in Cercedilla. Summer adds the river pools — Las Berceas above Cercedilla — for the pre-lunch swim.
Staying up here inverts the crowds: hotels from around €45 in Cercedilla, walkers’ hostals at the pass, and first-light trails while the Madrid trains are still loading. The C-8 puts the capital an hour away when you want it back.
Questions, answered
Where to sleep: Cercedilla
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