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Half Marathon Calendar near Harwell 2025-2026

Monthly updates for Harwell

Get new running races (and updates) in your inbox every month.

Explore the top half marathons near Harwell for 2025-2026! We've gathered 30 exciting races in the area. Check out our detailed list below to find your next local race.

February 2026
Feb
8
Su

The One in the Woods - Henley

Trail Run 10 km Half Marathon
Feb
22
Su

Wokingham Half

Half Marathon
March 2026
Mar
15
Su

Ramsbury Half & 10km

10 km Half Marathon
Mar
22
Su

Reading Half Marathon

Half Marathon
Mar
24
Tu

Elephant Challenge - Harwell

Trail Run 5 km Half Marathon Marathon 80 km
Mar
29
Su

Fleet Half Marathon

Half Marathon
Mar
29
Su

White Horse Half Marathon

Half Marathon
April 2026
Apr
11
Sa

Henley River Half Marathon

Trail Run 10 km Half Marathon
Apr
19
Su

Dell 10km & Half Marathon

10 km Half Marathon
May 2026
May
10
Su

The Lexicon Bracknell Half Marathon

Half Marathon
May
16-17
Sa - Su

London West Spartan Weekend

Obstacle Run 5 km 10 km Half Marathon
June 2026
Jun
14
Su

The Hampshire Hoppit

Trail Run 10 km Half Marathon Marathon
Jun
28
Su

Marlow Trail Run

Trail Run 5 km 10 km Half Marathon
Jun
28
Su

SOX 10km & Half Marathon

10 km Half Marathon
July 2026
Jul
5
Su

Chiltern Ridge Half Marathon

Trail Run Half Marathon
Jul
18
Sa

Ciderthon

5 km 13 mi
Jul
18
Sa

The Ciderthon

5 km Half Marathon
Jul
26
Su

Maidenhead Trail Run

Trail Run 5 km 10 km Half Marathon
August 2026
Aug
9
Su

Newbury Racecourse Half Marathon

5 km 10 km Half Marathon
Aug
9
Su

Burnham Beeches Half Marathon

10 km Half Marathon