Start with the race you can actually prepare for
For a first ultra, a useful starting point is a supported event on terrain you can practise, with a date that fits your life and cutoffs you can assess honestly. A marked 50K may belong on that shortlist. So might a different distance if your experience and priorities point that way. The number alone cannot make the choice.
Before looking at medals or entry countdowns, write one sentence: “I want to finish my first ultra on familiar trails, with straightforward travel and enough time to enjoy the day.” Yours might put mountain scenery, running with a friend or fundraising first. That sentence gives you something to check every tempting race against.
Then choose three non-negotiables. These are conditions a race must meet, even if everything else looks lovely. A spectacular finish photograph cannot move your work rota.
- Preparation: the terrain and skills you can realistically practise before race day.
- Practical limits: your maximum total spend, available dates and travel arrangements.
- The experience: the support, company or type of route that matters most to you.
Read the route, not just the distance
A 50K is about 31.1 miles, roughly 7.8 km beyond a marathon. A 50-mile race is about 80.5 km. Check the units wherever a race name simply says “50”. The extra distance is a substantial change to the day you are planning.
Two 50K routes can also have very different demands. Read the elevation profile alongside the map. Total ascent tells you how much climbing is advertised; the profile shows whether it arrives as frequent short hills or a few long climbs. Look at the descents too. A steep, rocky descent calls for different experience from a smooth path.
Match the course to somewhere you can practise
List the surfaces you use regularly: road, gravel, mud, rocky trails or open hills. Then note what would be new on the race route. If most of your running is on flat paths, choosing a hilly trail ultra adds terrain preparation as well as distance. Work out where that preparation will happen before buying the entry.
Look for exposed sections, altitude, river crossings and navigation requirements in the event guide. Course photos and recent participant accounts can help you understand the setting, but use the organiser’s current instructions for the route and rules. A previous runner’s dry day is not a weather forecast.
Choose the shape of the day
A loop returning to the start can simplify travel and baggage. A point-to-point route offers a journey to a different finish, but you need a way back or onward. Neither format guarantees access to your bag during the race.
A stage race adds arrangements between running days, while timed and backyard events have their own rules for continuing and stopping. If the format is unfamiliar, understand it before comparing headline distances.
Work backwards from every cutoff
A cutoff is a deadline for reaching or leaving a checkpoint, or finishing the course. Find out which it means, whether it is measured from your wave’s start and whether the earlier checkpoints impose separate limits. A generous finish deadline does not automatically give you plenty of time at the first checkpoint.
Include the minutes spent filling bottles, eating, changing layers, checking directions and waiting. Your watch’s moving pace leaves those minutes out; the race clock keeps them in.
Here is an illustrative 50 km race with a nine-hour limit. The arithmetic shows how stopping time changes the movement budget. These are whole-course averages, not suggested running paces or a forecast for either you or a particular route.
| Time budget | Time available | Average across 50 km |
|---|---|---|
| Whole race, including every stop | 9 hours | 10 min 48 sec per km |
| Movement after allowing 45 minutes stopped | 8 hours 15 minutes | 9 min 54 sec per km |
| Movement with those stops and a further 30-minute margin | 7 hours 45 minutes | 9 min 18 sec per km |
Turn the calculation into a useful question
Compare that budget with your own experience on similar terrain, including walking and stops. Then consider each checkpoint, rather than assuming a steady pace throughout. If the plan only works with no delays and a much faster finish than you have a reason to expect, keep looking or discuss the choice with a qualified coach.
If you intend to walk substantial sections, check that the event accepts walkers and that its checkpoint timetable supports your expected progress. “Walking allowed” and “I can finish within the limits” are separate questions.
Find out what “supported” includes
Support is a collection of arrangements, not a single promise. An aid station supplies runners on the route. A crew is someone who brings you permitted personal supplies. A pacer accompanies you on an allowed section. A race can provide aid stations while banning both crews and pacers.
For each option, find answers to the questions below. Save the actual event guide or organiser’s reply alongside your notes so you can revisit the details later.
- Navigation: is the route marked, and what navigation equipment or skills are still required?
- Supplies: where are the aid stations, what do they provide and what is the longest gap between them?
- Food: can the organiser confirm ingredients or dietary arrangements that matter to you?
- Personal help: where may spectators go, and are crews, pacers or drop bags permitted?
- Withdrawal: who must you contact, where can you leave the course and how is return transport arranged?
- Entry: are there age limits, qualifying performances, documents or equipment requirements, and when must you meet them?
Eligibility is only the first check
Being allowed to enter tells you that you meet the organiser’s entry rules. It does not assess whether this is the right race for your current preparation. Write down the practical skills the event requires and where you still need help. Take that list into a conversation with a coach if the demands are difficult to judge.
Three real races, three different decisions
These southern England events illustrate the comparison process. They are not a ranking of the best beginner races. We have included two 50 km options and a 50-mile option deliberately: all might appear in a search for a first ultra, but they ask different questions of you.
Dates and entry fees below refer to the advertised 2027 editions. Prices are published entry tiers, not a live quote or confirmation that places remain. Recheck the exact package before paying.
| What to compare | Hundred Hills 50K | Race to the Stones: Thames Valley 50K | South Downs Way 50 |
|---|---|---|---|
| 2027 date | 20 March | 10 July (Day One) | 10 April |
| Distance | 50 km (about 31.1 miles) | 50 km (about 31.1 miles) | 50 miles (about 80.5 km) |
| Route | Two different 25 km loops from Stonor Park | Lewknor to Lattin Down; the Day One route | Worthing to Eastbourne |
| Published ascent | About 1,200 m | 720 m in the route reference, which still shows 2026 dates. Confirm for 2027. | About 1,750 m |
| Finish limit | 9 hours; intermediate cutoffs also apply | Confirm the 2027 Day One timetable. The older route reference says 15+ hours. | 13 hours; intermediate cutoffs also apply |
| Support to check | Marked course; no crews or pacers | Marked route reference; confirm the 2027 checkpoint and support arrangements | Marked course; no crews or pacers |
| Published entry price | £80; £82 for unaffiliated runners | £85 super early bird, £90 early bird, £95 standard, £100 late release | £118; £120 for unaffiliated runners |
| A key entry check | Check the current entry form and event requirements | Select the standalone Day One 50K package | A marathon-distance race completed within its cutoff between 1 January 2022 and race day |
- Hundred Hills 50K: official 2027 event details
- Race to the Stones: 2027 dates and entry packages
- Race to the Stones: route reference (still displays 2026 dates)
- South Downs Way 50: official 2027 event details
What that means for your shortlist
If returning to your starting point is a priority, examine Hundred Hills first. That simplifies one transport question, but it does not remove the climbing or the need to check the timetable. A convenient route shape and a suitable physical challenge are both necessary.
If a summer date appeals, examine the Thames Valley 50K package. Check the finish location carefully: Day One ends at Lattin Down, not at the Avebury finish associated with the full event. Resolve the current cutoff and return journey before treating it as a match.
If you are considering South Downs Way 50, put the 80.5 km distance at the top of your notes. A qualifying marathon result answers an entry question; it does not by itself explain how you will prepare for the extra distance and hills.
How different runners might choose
These are illustrative scenarios to show the decision process, not accounts of real runners or predictions that someone will finish.
You have run a road marathon but rarely use trails
Your main unknown may be the terrain. Start by comparing marked routes with surfaces you can visit or practise locally. Check how the hills and stops affect the cutoff budget, then decide whether the race date leaves room for the preparation you need.
You might shortlist a 50K and set aside a more remote mountain event for another occasion. A marathon result may open an entry form for a longer race, but it does not have to decide your first ultra for you. The useful next action is to investigate the course, not automatically increase the distance.
You know mountain trails but have never raced an ultra
Familiar terrain may matter more to you than a flatter route. Compare a mountain option with the kind of days you already spend outside, then look closely at the racing details you may not have encountered: compulsory equipment, checkpoint deadlines and withdrawal procedures.
Do not assume confidence on local hills transfers to an unfamiliar route at altitude or at night. Record those differences explicitly. You might choose a hilly first ultra because its setting suits your experience, provided the event’s specific demands also fit.
Your priority is finishing with a friend on a modest budget
Begin with dates and travel you can both manage. Compare your expected progress against the cutoffs together, and confirm whether you can start in the same wave. Agree what happens if one of you needs to stop. Sorting that out beforehand is kinder than negotiating it at a checkpoint.
A local event with a higher entry fee may work out cheaper once accommodation and transport are included. If running for a cause is part of the plan, compare a normal entry with fundraising separately against a charity place with its own fundraising commitment. Read the actual terms for each.
Budget for the weekend, not just the entry
Put the full cost beside each race. Include transport, parking or shuttles, accommodation, meals, equipment you still need and any optional extras you actually want. For a charity place, record the fundraising target and deadlines separately from your own spending.
Here is an illustrative budget, not a quote for the races above: an £80 entry plus £35 travel, an £85 room, £25 meals and £30 of missing kit totals £255. A local £100 entry with £20 travel, £20 meals and the same £30 of kit totals £170. Comparing only the entry fee would point you towards the more expensive weekend.
Make the return journey as clear as the start
Check when registration closes and whether the first train or bus arrives early enough. For a point-to-point race, note where your car and finish bag will be, the last return connection and whether a shuttle needs advance booking. Include a plan for arriving at the finish later than hoped.
Ask how transport works if you withdraw, including possible waits and where you will be taken. If a friend is collecting you, agree a way to update them. Finally, read the refund, transfer and deferral terms before committing to travel you cannot change.
Five mistakes worth catching before you enter
- Treating “beginner friendly” as an assessment of you. Translate it into specific features such as course markings, support and deadlines, then check whether those features meet your needs.
- Borrowing a friend’s finish time. Their preparation, conditions and time spent stopped may differ from yours. Use relevant personal experience to examine your own plan.
- Reading the wrong package. Day One, Day Two, non-stop and a weekend entry can have different starts, finishes, prices and arrangements.
- Using last year’s guide without checking it. A page can advertise the next edition while a linked route or transport page still describes an earlier one. Ask about contradictions that affect your decision.
- Letting a closing entry window answer an unresolved question. If you cannot establish a critical requirement, keep that race in the “needs checking” column. Another edition or another event can stay on the table.
Build your own three-race shortlist
Write your three non-negotiables first, then fill in up to three race options. Use the exact edition and distance package. Record missing information as a question instead of quietly treating it as a favourable answer.
Mark each option “Worth pursuing”, “Needs checking” or “Does not fit”. One failed non-negotiable can be enough to set a race aside; several attractive extras do not cancel it out. The worksheet organises your decision and does not score your fitness.
Your notes stay in this open page. Download or print them before leaving or refreshing. You can also print a blank worksheet.
My three non-negotiables
________________________________________________________________ ________________________________________________________________
Option 1
- Race name, date & distance package
- ________________________________________________________________
- Distance, ascent & terrain
- ________________________________________________________________
- Finish & checkpoint cutoffs
- ________________________________________________________________
- Navigation, supplies & withdrawal
- ________________________________________________________________
- Entry requirements
- ________________________________________________________________
- Total budget
- ________________________________________________________________
- Start, finish & return journey
- ________________________________________________________________
- What still needs checking?
- ________________________________________________________________
- Decision
- Needs checking
Option 2
- Race name, date & distance package
- ________________________________________________________________
- Distance, ascent & terrain
- ________________________________________________________________
- Finish & checkpoint cutoffs
- ________________________________________________________________
- Navigation, supplies & withdrawal
- ________________________________________________________________
- Entry requirements
- ________________________________________________________________
- Total budget
- ________________________________________________________________
- Start, finish & return journey
- ________________________________________________________________
- What still needs checking?
- ________________________________________________________________
- Decision
- Needs checking
Option 3
- Race name, date & distance package
- ________________________________________________________________
- Distance, ascent & terrain
- ________________________________________________________________
- Finish & checkpoint cutoffs
- ________________________________________________________________
- Navigation, supplies & withdrawal
- ________________________________________________________________
- Entry requirements
- ________________________________________________________________
- Total budget
- ________________________________________________________________
- Start, finish & return journey
- ________________________________________________________________
- What still needs checking?
- ________________________________________________________________
- Decision
- Needs checking
Choose the next action before choosing the race
Look at the strongest option and find the one unanswered question that could change your decision. It might be a checkpoint deadline, the route surface, a qualifying requirement or getting home. Resolve that first. If the answer rules the event out, move to the next option without trying to bargain with your non-negotiables.
When a race fits, save the edition-specific entry terms, course information and your travel plan. Use its requirements to build your preparation brief, and revisit the organiser’s final instructions nearer the date. Your shortlist has done its job when you can explain why this particular event suits the day you want to have.
Sources & further reading
Written by Running for Good Ultra using the organiser sources linked below. Race facts were checked on 9 September 2026. The comparisons and worksheet are our editorial analysis; the runner scenarios are illustrative, not personal race reports. This guide helps with event selection and does not assess individual fitness.
- Hundred Hills 50K: official 2027 event details
- South Downs Way 50: official 2027 event details
- Race to the Stones: 2027 dates and entry packages
- Race to the Stones: route reference (still displays 2026 dates)
Found something that needs correcting? Let us know.