Most “best half marathons in the UK” lists are written by and for people who say the word “splits” out loud in conversation. Courses get ranked by how fast they are, as though the only thing between you and a 1:29 is an unfortunate camber somewhere around mile nine.
This is not that list. This is for people who will be out there for two hours. Or two and a half. Or a bit longer than that, thanks, and who would quite like the marshals still standing there when they arrive. What matters at the back of a race is a different set of things entirely, and almost nobody writes them down.
What actually makes a half marathon good if you are slow
The cut-off is the headline, and it is usually more generous than the panic in your head suggests. Four hours is the common figure at the big city races — north of eighteen minutes a mile. If you can walk briskly you are inside it. The number on the website is only half the story, though. A four-hour limit counts for very little if the finish line comes down at three and a half.
Then there is the crowd. Big-city halves have supporters lining the route who have no idea what a good time is and will scream for anyone, which is worth several minutes a mile in a way no coach can explain. Smaller races are lovely, but by the time you reach mile ten there may be one man with a dog and neither of them is looking at you.
Then the wave system, which people underestimate. Being put in a pen full of people running roughly your pace is the difference between a nice morning and thirteen miles of being overtaken by a man dressed as a rhinoceros. Every race below gets this right.
Six UK half marathons worth the entry fee
Great North Run — Newcastle to South Shields, 13 September 2026
The world’s biggest half marathon, and in 2026 it turns 45 with 63,000 people on the start line. That number is the point. Nobody at the Great North Run is looking at you, because there are sixty-two thousand nine hundred and ninety-nine other people to look at instead. Entry is by ballot and it is competitive. Two things worth knowing: you are allowed to drop back to a slower wave on the day without asking anyone, and miles 8 to 12 go uphill, which is a rude thing to do to someone who was told the course is famous for its downhill start.
Cardiff Half Marathon — 4 October 2026
Flat, fast roads round the Welsh capital, and one of the better-supported races in Europe. More usefully, Cardiff is unusually straight with slower runners: the cut-off is four hours, there is a sweep bus rather than a shrug, and the organisers say in writing that you are welcome to walk sections. That sentence on a race website is worth more than any elevation profile. Entry moved to a ballot for 2026.
The Big Half — London, 6 September 2026
Starts at Tower Bridge, finishes by the Cutty Sark, and spends the middle bit going through Tower Hamlets, Southwark, Lewisham and Greenwich. It has only existed since 2018 and it was built deliberately as the inclusive, community end of London road racing rather than the elite end. The support through the boroughs is loud and local and does not thin out just because you have been overtaken by the four-hour pacer. If you want a London half that does not feel like an audition, this is it.
Great Scottish Run — Glasgow, 4 October 2026
City centre start, city centre finish, and a half marathon that starts at 8:30am, which is either a blessing or the single worst thing you have ever read, depending on your relationship with alarms. Glasgow turns out for it. Standard entry is £45, rising to £48 closer to the day, so the usual rule applies: book early and be smug about it for six months.
Bath Half — 14 March 2027
Running since 1982, on closed roads through the middle of a genuinely beautiful city, and it has raised more than £30 million for charity since 2000. It is the biggest charity fundraising event in the south west, which tells you what the field is like: a lot of people running for a reason rather than for a time. That changes the atmosphere at the back of a race more than any course feature does.
Brighton Half Marathon — 28 February 2027
It calls itself the UK’s Happiest Half and the branding is doing less work than you would expect. You start at Hove Lawns, head east past the Palace Pier, loop around the Royal Pavilion and The Level, then go out along Marine Parade towards the Roedean clifftops before turning for home. Be honest with yourself about the coast road. It is exposed, it is late February, and the wind out by Ovingdean has ruined more pacing plans than any hill in Britain.
One more, if you have a charity in mind: the Royal Parks Half runs on 11 October 2026 through central London parkland, entry this year is via charity places, and the cut-off is four hours from the last wave — roughly 18:19 per mile. Walkable for most people, but central London road reopening times mean it is enforced properly rather than politely.
What to actually wear for 13.1 miles
A half marathon is long enough that small irritations become large ones. The seam that was fine on your Saturday five miler will introduce itself around mile nine, and there is no fixing it once the gun has gone. Test everything on a long run first.
Our Suffer running shorts are cut for people who are out there a while: a waistband that stays where you put it, and a pocket that holds a gel and a house key without slapping your leg for two hours. Pair them with the Blister running socks, the least glamorous purchase you will ever make and the one you thank yourself for at mile eleven. For a September start or an exposed seafront, the Brow Mop cap keeps sweat and low autumn sun out of your eyes. Everything else lives in The Kit.
Common questions
Is there a time limit on UK half marathons?
Usually, and at the big city races it is commonly four hours. Cardiff publishes a four-hour cut-off with a sweep bus; the Royal Parks Half sets four hours from the last wave, about 18 minutes 19 seconds per mile. Smaller races often have no formal limit. Check the event page rather than assuming, because the limit is set by road reopening times and varies wildly by city.
Can you walk part of a half marathon?
Yes, and some races say so explicitly — Cardiff tells entrants in writing that walking sections is fine as long as you stay ahead of the cut-off. Run-walk is a legitimate strategy rather than a failure state, and plenty of people finishing in the middle of the field are doing it deliberately.
Which UK half marathon is best for a first-timer?
A big one. The instinct is to pick something small and quiet to hide in, but large city races give you wave starts, crowd support that lasts all day, published cut-offs and a field wide enough that you never run alone. The Great North Run and the Big Half are both built for it.
Do I need to enter a ballot for a UK half marathon?
For some of the biggest ones now, yes. The Great North Run runs a ballot and Cardiff introduced one for 2026. Where a ballot exists there is normally a charity place too, which means committing to a fundraising target rather than a time. Most UK halves are still first-come entries.
What happens if I finish last?
Almost certainly nothing you are dreading. At a race with 63,000 entrants the odds of it being you are remote, and the people who do come in last tend to get the loudest reception of the day. Worst realistic case: the roads have reopened and a marshal walks you in on the pavement. Still a medal.
Related reading
If a ballot has already gone badly for you this year, we wrote about what to do next in Rejected From the London Marathon Ballot?. For the pacing arguments in your own head, try In Defence of the 35 Minute 5K. And before you spend forty minutes deciding what to put on at 6am, our temperature guide will do it for you.
Enter something. Regret it slightly. Do it anyway. Suffer every mile. Still no medals — except at these ones, where there is definitely a medal.