Leiden Marathon
Race snapshot
Race Day
50–63°F · Feels mild
Total elevation gain
Relatively flat course · Net elevation change +0 ft
Participants
Large field
Crowd Rating
Excellent spectator turnout
The Lowdown
The Leiden Marathon returns for its 36th edition on Sunday, May 9, 2027, as the main event of a weekend that opens the evening before with a floodlit 5K night run. Established in 1991, the race is organized by marathon.nl and draws more than 14,000 runners across all distances each year, with roughly 1,000 tackling the full marathon. The single-loop, AIMS-certified course starts on Koninginnelaan and finishes at the historic Vismarkt, tracing Leiden's canal-lined city center before heading out through flat surrounding polders and green villages and looping back through crowd-lined streets to the finish arch. Distance sponsors include SWIS (marathon), Bunnig & Partners (half marathon), Zorg en Zekerheid (10K), PF Concept (5K night run), and Corpus (2.1K Kids Run). The flat, fast layout has made Leiden a recognized Boston Marathon qualifying course. Registration for the 2027 race opens October 1, 2026 at noon; prices are set at €69 for the marathon, €42 for the half marathon, €29 for the 10K, and €16 for the 5K night run, with the Kids Run free.
Questions about the Leiden Marathon 2027
When is the Leiden Marathon 2027?
Sunday, May 9, 2027.
Where is the Leiden Marathon?
Leiden, South Holland, Netherlands.
What time does the Leiden Marathon start?
The race starts at 8:30 AM, local time.
What is the Leiden Marathon time limit?
6 hours.
How do I enter the Leiden Marathon 2027?
Registration has not opened yet. Oct 1, 2026: Online registration opens. Ways in: Online registration via marathon.nl (opens October 1, 2026).
How much does the Leiden Marathon 2027 cost?
Marathon: €69. Half Marathon: €42. 10K: €29. 5K Night Run: €16.
What is the Leiden Marathon elevation gain?
15 m (49 ft) of total elevation gain. Net elevation change: +0 m (0 ft). Relatively flat course.
What is the Leiden Marathon course like?
It passes Vismarkt (finish, historic fish market square), Leiden canal-lined historic city center and Koninginnelaan (start).
What is the weather like at the Leiden Marathon?
Race-day temperatures are usually 10–17 °C (50–63 °F). Feels mild.
How many runners does the Leiden Marathon have?
14,000 participants. Large field.
Is the Leiden Marathon a Boston qualifier?
Yes. This race is a certified Boston Marathon qualifying event.
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