Half marathon finish times typically range from 1 hour 30 minutes to 2 hours 30 minutes. The average UK half marathon finish time is around 2 hours.
How long do I need to train for a half marathon?
Most runners need 10–16 weeks to train for a half marathon, depending on current fitness. A base of regular 5K or 10K running is recommended before starting.
How much do half marathons cost in the UK?
Entry fees for UK half marathons typically range from £25 to £60. Major events like the Great North Run or big city halves are usually at the higher end.
Knebworth House, Old Knebworth Lane, Knebworth, UKSun, 1 Nov 202609:00
10kHalf MarathonRoadUndulatingSingle day race
Join us for the Hertfordshire Half Marathon & 10K on Sunday 1st November 2026
The Hertfordshire Half Marathon & 10K returns for 2026, and registration is now OPEN! Taking place on Sunday 1st November, this exciting event is set in beautiful Old Knebworth, offering runners of all abilities a memorable race experience.
Both races feature undulating, scenic road routes through the picturesque Hertfordshire countryside. Whether you're tackling the Half Marathon or the 10K, you'll enjoy a welcoming race-day atmosphere, excellent support from marshals, and clear route markings. It's the perfect autumn challenge for seasoned runners aiming for a new PB or first-timers stepping up their distance.
Book your spot now at our Early Bird Prices!
Race Distances & Start Times
09:00 am - Half Marathon start
Distances: 21.1m
Cut-off: 3 Hours (12:00)
09: 30 am - 10k start
Elevation: 92m, Road (undulating)
Cut-off: 1.5 Hours (11:00)