Address and contact

De Helderse Vallei
De Helderse Vallei 9-11
1783 DA Den Helder
telephone +31 (0)223 61 25 55

Suspicious or possibly dangerous situations outside opening hours? Call DEKO Security: +31 (0)653191489 (24 hours a day).

Opening times

  • Monday: closed
  • Tuesday: 10am - 4.30pm
  • Wednesday: 10am - 4.30pm
  • Thursday: 10am - 4.30pm
  • Friday: 10am - 4.30pm
  • Saturday: 10am - 4.30pm
  • Sunday: 10am - 4.30pm

Please note: De Helderse Vallei is closed due to the lockdown from the central government to get the coronavirus under control.


  • In response to the measures to control the spread of the coronavirus, a mask obligation will apply from November 6, 2021 inside the sustainability center
  • If people are close to each other they can easily pass on the virus. Staying 1.5 metres away from others is still one of the best ways to prevent the virus spreading. Activities where it is not possible to keep 1,5 meters away have unfortunately been cancelled. 
  • Due to the coronavirus crisis, note that special guidelines currently apply in the Netherlands: click here for details.
  • From 1 May to 30 September, the grounds and the city farm are open until 5pm.
  • De Helderse Vallei is also open on Mondays during the school holiday period for the Northern zone of the Netherlands.
  • De Helderse Vallei is closed on King’s Day, Christmas Day, Boxing Day, New Year's Eve and New Year's Day.
    On 5 December, De Helderse Vallei closes at 4pm.


Admission to De Helderse Vallei is free-of-charge.


De Helderse Vallei is located at the Donkere Duinen car park in Den Helder.

Train and bus
From Den Helder Central Station, take the line 31 bus to Station Zuid Westzijde. After getting off the bus at the Zandkreekweg/Duinroosstraat bus stop on Jan Verfailleweg, do not walk in the direction taken by the bus as it drives away (it turns off to the left). Follow Jan Verfailleweg towards the beach and the Donkere Duinen woodlands. Cross the road at the next traffic lights and you will see the entrance to De Helderse Vallei on the far side of the Donkere Duinen car park. In the high season, the 'kustbus' (coastal bus) takes the scenic route past De Helderse Vallei. You can view the timetable here:

If your navigation system is not up-to-date, enter Den Helder, Jan Verfailleweg 620 as the address. Coming from Alkmaar/Den Oever, take the 'Julianadorp Zuid/(Strand)' exit off the main road (N250/N9). Keep following the road to the right and turn left on Callantsogervaart (follow ‘Strand’ on the signs). At the end, you turn right onto Zanddijk. Follow the road with the dunes and Mariëndal nature reserve on your right and drive into the Donkere Duinen woodland area until you see a turn-off just before the traffic lights. De Helderse Vallei is located on the right-hand side in the large car park.

There are charging stations for electric bicycles and vehicles in the car park and in the grounds of De Helderse Vallei.

Chamber of Commerce, VAT and bank account number

Chamber of Commerce no. 37148552
IBAN NL30 RABO 0101 4613 21

De Helderse Vallei has been realized thanks to the European Agricultural Fund for Rural Development: Europe invests in rural areas.