L'Isle-Adam and its beach on the Oise
L'Isle-Adam is a town in the Val-d'Oise on the banks of the Oise, with a state forest close by. Its summer draw is the municipal beach, often called the "plage fluviale" or river beach. The name is misleading. It is a leisure site on the riverbank with swimming pools. You swim in the pools, not in the river, so do not plan on swimming freely in the Oise. Boat and paddle activities do take place on the Oise.
The dates below belong to the 2026 season, which ended on August 31. No pool opening is set after that date for 2026. For a visit in autumn or spring, count on the forest and the riverbanks, and check the town's calendar for the next season.
L'Isle-Adam beach: 2026 hours and prices
Visitor rates published by the town for the 2026 season. Rates for residents and neighboring towns are different.
| Topic | 2026 season |
|---|---|
| Swimming | Weekends from June 6 to 28, then daily from July 1 to August 31, 10 a.m. to 7 p.m. Ticket office until 6 p.m., main pool until 6:45 p.m. |
| Day ticket | €21 from age 14, €12 for ages 5 to 13, free under 5. Family of 2 adults and 2 children under 14: €50. |
| Groups | From 20 people, €10 per person, booked at least 48 hours ahead. |
| Water activities and mini-golf | From May 8, weekends and holidays, 2 to 7 p.m. |
| Pedal boat | €15 per hour for 2 seats, €20 per hour for 4 seats. |
| Paddleboard or canoe | €15 per hour. |
| Mini-golf | €8. |
Rentals run from 2 to 7 p.m., with a last start at 6 p.m. The water activities cannot be reserved in advance.
Tours around L'Isle-Adam and Val-d'Oise
Guided visits and day trips in the Val-d'Oise and nearby, with live prices and availability.
Before you come: safety, forest and access
The beach rules and a few pointers for a walk.
Beach rules
Children under 10 must be with a responsible adult. Swim shorts and board shorts are banned in the pools. Wear briefs or boxer-style trunks, or a one- or two-piece swimsuit. Children under 5 need a flotation aid. Lifeguards do not replace parental supervision.
Pools and river
The Bassin Plage measures 40 m by 20 m, and the Bassin Record sits next to it. Pedal boats, paddleboards and canoes go out on the Oise. Do not read the name "river beach" as permission to swim in the river.
The L'Isle-Adam state forest
The forest is a state forest in the Val-d'Oise, managed by the national forest service. Before a walk, check the 2026/2027 hunting calendar published for state forests, and do not rely on old hunting notices from the previous season. Do not confuse this forest with the La Roche-Guyon regional forest, which has its own calendar, explained on the Vexin page.
Getting there by train
L'Isle-Adam-Parmain station is on Transilien line H. Check the timetable for your day before you go, as no journey time is given here. Lines and 2026 fares are covered on the getting to Val-d'Oise page.
Planning a beach day
A simple outline for the summer season.
Arrive before the ticket office closes
Swimming opens at 10 a.m. The ticket office closes at 6 p.m. and the main pool stays open until 6:45 p.m., so arrive well before 6 p.m. if you want to get in.
Compare the family rate with single tickets
For 2 adults and 2 children aged 5 to 13, single tickets add up to €66 (2 × €21 and 2 × €12). The family rate is €50. Children under 5 are free.
Keep the afternoon for the water
Boats can be rented from 2 p.m., with a last start at 6 p.m. For a pedal boat or a paddle, plan the afternoon. Mini-golf costs €8 if children are waiting for their turn.
Outside the summer
The pools are not open after August 31, 2026. For an autumn outing, the forest is the better option, with an eye on the hunting calendar.
Also nearby
Other outings to round out the day or weekend.
L'Isle-Adam: frequently asked questions
Can you swim in the Oise at L'Isle-Adam?
No, count on the pools. The "river beach" is a leisure site with swimming pools. The activities on the Oise are pedal boats, paddleboards and canoes.
When is the beach open?
In 2026, weekends from June 6 to 28, then daily from July 1 to August 31, 10 a.m. to 7 p.m. The 2026 season is over, so check the town's calendar for the next one.
How much does it cost?
The 2026 visitor rate is €21 from age 14, €12 for ages 5 to 13 and free under 5. A family of 2 adults and 2 children under 14 pays €50.
Can I swim in board shorts?
No. Swim shorts and board shorts are banned in the pools. Pack close-fitting swimwear.
Do I need to book the water activities?
No, they cannot be reserved in advance. Only groups of 20 or more must book, at least 48 hours ahead.
Should I worry about hunting in the forest?
Yes, in autumn and winter. Check the 2026/2027 hunting calendar for state forests before a walk.