How much does it cost to run the Royal Parks Half Marathon? Every year the Royal Parks Half Marathon holds a free ballot, which if you are lucky enough costs £59 to secure your place. The Ballot for the 2022 event took place on 2nd February 2022. But if you've missed out, you can still secure a charity space. Until the End of June, Single Homeless Project is offering free registration on all of our Royal Parks Charity spaces when you pledge to raise £329 to help end homelessness in London. With a buzzing atmosphere, the Royal Parks Half Marathon takes you through a stunning autumnal route through four of London's Royal Parks. This scenic run is great for first time runners and is one of the most popular half marathons in London. Secure your place today.