Four natural sites in the Madrid region, and four different ways of deciding who gets in. One runs a lottery, one counts cars, one opens for a season and one charges a fare.
No two share a system, which turns planning into a question of mechanism rather than of destination. The Montejo beech forest draws its places on the 1st and 16th of each month, La Pedriza admits 75 vehicles first come first served, the five monitored bathing spots open 15 May to 15 September, and the Royal Botanical Garden charges €4, or nothing on a Tuesday morning.
Do I need to book to visit nature near Madrid? It depends on the site. The Montejo beech forest allocates places by lottery, La Pedriza caps access at 75 vehicles on a first-come basis, the five monitored bathing spots open 15 May to 15 September, and the Royal Botanical Garden charges €4. None of them shares a system with another.
Three of the four are free, and that is the problem
The distinction is not what you visit but how you get in. Three of the four charge nothing at all, so money is not the filter, which is exactly what catches out anyone arriving with ticket-office logic.
| Site | How access is rationed | Cost |
|---|---|---|
| Royal Botanical Garden | A fare, no quota and no booking | €4 |
| Bathing spots | Fixed season, 15 May to 15 September | Free |
| La Pedriza | Quota of 75 vehicles, first come | Free |
| Montejo beech forest | Lottery, five days to apply | Free |
The Botanical Garden is the one that charges, and the most generous
The Royal Botanical Garden works like a museum rather than a capped site. The fare the CSIC publishes is €4 general and €1 reduced, with no booking and no closure once full.
Its generosity is in the exemptions. Under-18s are free any day of the year, and on Tuesdays from 10:00 to 13:30 entry is free for everyone with nothing to prove. Opening is fixed year-round, since the Garden opens at 10:00 all 365 days, with seven different closing times spread across the calendar, as set out in its fares and hours.
It is the exact reverse of the beech forest: there you pay nothing and can barely get in; here you pay little and always can.
A car counter at La Pedriza, a paid booking at Las Dehesas
At La Pedriza the filter is physical. The Comunidad publishes a barrier at La Camorza with 75 spaces for private vehicles, opening in time bands and only while the quota lasts.
From 1 June to 30 September it opens Monday to Friday 7:30 to 10:30 and 18:30 to 22:30, and at weekends and on public holidays 7:00 to 9:30 and 18:30 to 22:30. A free shuttle runs from Manzanares el Real at weekends and holidays, and it is the only route that does not compete with the counter, as covered in how La Pedriza rations access.
In the same mountains, Las Dehesas at Cercedilla solves the same problem the other way round, with 240 vehicles, more than triple, but booked in advance and paid for.
The beech forest lottery is the hardest filter
The Montejo beech forest allows no independent walking. A pass or authorisation is required, every visit is guided, and the Comunidad draws places by lot rather than giving them out in order of application. There are three paths: the mirador, the hillside and the river.
The system opens at 9:30 on the 1st and the 16th of each month and releases the following fortnight. There are five days to apply and then the draw decides, so being first at 9:31 changes nothing. Groups run to 60 people, guides included, and the pass is confirmed 60 minutes before at the information centre, as detailed in how the booking works.
That entry control dates from 1989, twenty-eight years before Unesco listed the forest as Natural World Heritage in 2017. The cap is not a consequence of the recognition; it predates it.
The bathing spots have no quota, they have a calendar
The five monitored bathing spots that the Comunidad censuses do not cap visitor numbers, and it is the Comunidad that sets their season. What they cap is the period, 15 May to 15 September, with a minimum of eight water samples per season published through Náyade.
They are El Muro and Virgen de la Nueva on the San Juan reservoir, Las Presillas at Rascafría, Los Villares at Estremera and Playa del Alberche at Aldea del Fresno, covered in where you can legally swim. The Comunidad bans swimming along the whole course of the Manzanares, and specifically at La Charca Verde since 2016.
National Park and Regional Park are not the same thing
The two categories carry their own rules and management. La Pedriza belongs to the Parque Regional de la Cuenca Alta del Manzanares, declared by Ley 1/1985 of 23 January, not to the Sierra de Guadarrama National Park.
The Montejo beech forest sits inside the Sierra del Rincón Biosphere Reserve, designated by Unesco on 29 June 2005, and had been a Site of National Natural Interest since 1974.
Three separate categories in the same mountains, dated 1974, 1985 and 2005, each explaining why access is rationed the way it is.
Guided activities come from two networks that do not list each other, the region’s 12 centres and the city’s own, both free, with advance registration standard on the municipal side.
At the region’s picnic areas the strictest rule is about use rather than access, because fires for cooking or warmth are banned on all 365 days, under the INFOMA plan.
One case runs on neither quota nor booking but on residence: in Patones de Arriba the village spaces are for accredited residents only, checked by camera.
Frequently asked questions about visiting nature near Madrid
Do I need to book to visit nature near Madrid?
It depends on the site. The Montejo beech forest allocates places by lottery, La Pedriza caps access at 75 vehicles on a first-come basis, and Las Dehesas at Cercedilla requires a booking and a fee.
Which natural site near Madrid is hardest to get into?
The Montejo beech forest. There is no independent access, a pass is required, and places are drawn by lot among everyone who applies in the five days after the system opens on the 1st and the 16th of each month.
Is La Pedriza inside the Sierra de Guadarrama National Park?
No. La Pedriza belongs to the Parque Regional de la Cuenca Alta del Manzanares, declared by Ley 1/1985. They are two separate protection categories with their own rules and management, despite sharing the same mountains.
When can you swim in the rivers around Madrid?
From 15 May to 15 September, the season the Comunidad de Madrid authorises at its five monitored bathing spots. Outside those dates the places still exist but no water sampling is scheduled.
A lottery, a car counter, a calendar and a four-euro ticket, for four sites in one region.