An ultra is anything longer than a marathon, and the jump from 26.2 miles to your first ultra is smaller than it sounds — if you pick the right race. Here's what to look at.
Start at 50K
A 50K (31 miles) is only five miles longer than a marathon. On trail you'll walk the climbs anyway, so it often feels like a long day out rather than a race. Save the 100 milers for later.
Check the cut-offs
Generous cut-offs let you walk sections without panic. Look for events that publish them clearly and allow at least 8–9 hours for 50K on trail.
Pick a route you can follow
Waymarked courses and national trails — the Ridgeway, South Downs Way, Thames Path, Cotswold Way — are easier than unmarked fell or mountain routes where you're expected to navigate.
Look at the aid stations
Checkpoints every 8–10 miles with real food make a huge difference. Big organisers like Centurion, Threshold and GB Ultras are known for well-stocked stations.
Read the mandatory kit list
Most UK ultras require kit: a waterproof jacket with taped seams, foil blanket, whistle, phone, head torch, cup and some food. Buy and test it in training, not the week before.
Give yourself time
If you're already running a marathon comfortably, 16–20 weeks is a sensible run-in for a 50K, with back-to-back long runs at weekends and plenty of time on feet.
Browse every UK ultramarathon by month and region.
