Cycling & running events in Leiden, 2026

Leiden Base Miles

Running: Locals run the singels, the Oude Rijn edges, and the tight city centre when they want quick intervals without leaving town. Leiden Run Club starts free social runs every Sunday at 10:30 AM from De Morspoort, with coffee after. Stichting We Run The City keeps the training steady in Leiden. The city centre gives you bridges, stones, corners, and that proper zweet op de kop feeling. The race calendar offers 195 km total. 100 Bruggenloop, Singelloop Leiden, Glibbertreel Leiden, Zorg en Zekerheid Circuit, and Leidse Houtloop keep the calendar honest.

Cycling: Locals ride out fast because pedal power just works here. Swift-Leiden is the straight club option, and Raas rolls social rides every Thursday around 19:00h. Keytown cruisers gives the group-ride fix when solo Z2 starts getting boring. The Dune & Sea Route gives 33 km through Leiden, Wassenaar, and Katwijk, with North Sea air only 8 km from town. The Dune Region gives the nearest climbs, and the dunes reach 25 metres when you want something more than flat base miles. The Mills & More Route passes 20 windmills over 34.8 km. The Trekvaart route works the waterways of Leiden and Oegstgeest. The Limes Matilo route gives 15 km through Archeologisch Park Matilo.

Season: South Holland works best in April-June and September-October, when legs come around and the calendar feels full. Spring gives 12-20°C days, and late April brings the Bollenstreek peak between Haarlem and Leiden. Leiden summer is long enough for evening intervals, easy spins to Katwijk, and heat-aware runs where locals watch heart rate and carry a water-and-salt plan. Early autumn gives 20-22°C days, which is perfect for gran fondo pace without drama. Winter changes the rhythm for both sports. The Netherlands often sits at 0-8°C in winter, and December can shrink daylight to 7-8 hours, so locals keep it short, steady, and close to home.