Mystery Marathon & Half Marathon

Milton Keynes, United Kingdom

Expected June 2027

We haven't been able to confirm this year's date. We'll update you if it's announced.

Choose your distance

Marathon

Distance

42.2km

Start Time

08:30

Cutoff

07:00

Terrain

Mixed

From last year's edition. Details may change once confirmed.

Overview

Join the Mystery Marathon & Half Marathon on June 25, 2026, in Milton Keynes! Experience stunning lake views, a traffic-free course, and unique mystery medals.

Scenic lake views
Traffic-free course
Mystery medal

The practical side

Start / Finish

Start

Caldecotte Lake, Milton Keynes

Finish

Caldecotte Lake, Milton Keynes

Terrain

Wide hard wearing lake paths, small parts of concrete as well as grass/mud sections. Most runners will wear road shoes.

Route

7½ scenic laps of Caldecotte Lake (clockwise).

Getting There

Close to central Milton Keynes, easy access for 3 different train stations along with the A5 & M1.

Good to know

What you get

Finisher medal

Chip timing

Bespoke 80mm mystery medal

Time keeper

Car parking

On the day

Toilets

Marshals on course

First aid on course

RecommendedRoad shoes

Parking · FreeYes, free parking available for all at the Hickory Smokehouse.

Public transportClose to central Milton Keynes, easy access for 3 different train stations along with the A5 & M1.

Aid stationsWater and toilets are available every lap of the lake course.

Before you enter

RefundsNo refunds under any circumstances. You can defer out of an event up to 7 days before the event date and transfer to another Enigma event that isn't closed to entries. Deferred entries must be used within 18 months of the original event date.

TransfersDeferral to another Enigma event up to 7 days before event date.

DeferralsEmail [email protected] with the event you'd like to transfer to. Deferral must be requested up to 7 days before the event date.

If the race is cancelledNo refunds under any circumstances. Deferral to another Enigma event up to 7 days before event date, must be used within 18 months.

Minimum ageParticipants must be aged 18 or over on race day for the marathon, and 17 or over for the half marathon.

Time limitMarathon - There is a hard time limit of 7:00 hours for the marathon & 5 hours for the Half. Anyone finishing over 7:00 will be recorded as a DNF.

Other questions

Registration opens at 08:00am, race starts at 08:30am.

Marathon: 7½ scenic laps of Caldecotte Lake (clockwise). Half Marathon: 3½ scenic laps.

Caldecotte Lake, Lakeside Grove, Milton Keynes, MK7 8HP. Premier Inn, Lakeside Grove, Bletcham Way, Caldecotte, Milton Keynes, MK7 8HP (150 yds off the A5 & 3 miles from M1. Look for a windmill!).

Entry fee

Registration isn't open yet. We'll show pricing when the organiser confirms.

Status unclear

Milton Keynes, United Kingdom

Expected June 2027

Provisional date, around Jun 24

We'll keep this updated as the organiser confirms.

Enigma Running

View organiser page →

Official website Organiser website

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Mystery Marathon & Half Marathon

Overview

The practical side

Good to know

What are the on the day timings?

How many laps for each distance?

Where is the event location?

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