Gremlins Marathons & Half Marathons

About the Event

Immerse yourself in festive spirit at Caldecotte Lake in Milton Keynes from 4–6 December 2026, as the Gremlins Christmas Half & Marathons brings together runners of all levels for an unforgettable winter experience. The scenic route around Caldecotte Lake offers several half marathon and full marathon distances to suit every runner’s challenge preference.
Participants can enjoy traffic-free laps encircling the tranquil lake while taking in stunning views of snow-covered landscapes under a backdrop of twinkling holiday lights. Each mile marker celebrates the season, adding cheer and motivation along your journey through this idyllic setting. Cross the finish line with pride to claim a unique limited-edition Gremlins medal commemorating your achievement.
The event’s centrally located area ensures easy access not only for runners but also their supporters who can take advantage of convenient parking spots nearby. Throughout the day, food and drink stations will be readily available at strategic points along the course to fuel participants as they push towards their personal goals or simply revel in the festive atmosphere.
No matter your motivation – whether it's striving for a new PR or merely enjoying the holiday vibe – this Christmas-themed marathon offers an experience that is both memorable and rewarding. Join fellow runners from around the globe at Caldecotte Lake, where winter wonder awaits during Gremlins Christmas Half & Marathons.

Races Offered

Gremlins Friday Half Marathon

Dec 04, 2026

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Distance — 21.1K

terrain

Type — Running

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08:30

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£34.99

Gremlins Friday Marathon

Dec 04, 2026

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Distance — 42.2K

terrain

Type — Running

timer

08:30

sell

£39.99

Gremlins Saturday Half Marathon

Dec 05, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

08:30

sell

£34.99

Gremlins Saturday Marathon

Dec 05, 2026

straighten

Distance — 42.2K

terrain

Type — Running

timer

08:30

sell

£39.99

Gremlins Sunday Half Marathon

Dec 06, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

08:30

sell

£34.99

Gremlins Sunday Marathon

Dec 06, 2026

straighten

Distance — 42.2K

terrain

Type — Running

timer

08:30

sell

£39.99

Weather History

These values represent the 3-year monthly averages for December in Milton Keynes.

thermostat Temperature

4.7° / 8.9°

wb_sunny Feels like

-0.2° / 4.5°

light_mode Avg sunshine hours

2h 45m

water_drop Avg rainfall

2.4 mm

ac_unit Avg snowfall

—

air Avg wind speed

19.0 km/h (Gentle breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Low (1.4)

humidity_mid Humidity

88.5%

wb_twilight Sunrise

09:03

nightlight Sunset

16:53

About Milton Keynes

Learn more about the host city, Milton Keynes.

Milton Keynes is a city of 245,000 people (2019) in the South East of England. Milton Keynes is well known in the UK as a planned city built in the 1960s with emphatically modernist architecture. Milton Keynes is a thriving city of contrasts; from innovative new business and entertainment hubs, to theatre, cinema, walks in natural parkland, pub lunches and peaceful canal trips; and yes, it really does have the famous concrete cows!