
At the Mission Trails Twilight Runs in San Diego, the 5K is the course you can run from start to finish: it stays close to 100 metres above sea level while the 25K turns off into the hills. Climbing strength matters little here; holding a high pace cleanly on trail matters a lot.
The course is essentially an out-and-back with a small turnaround loop at the far end: you run a little over two kilometres out, circle a few hundred metres and return the same way to the start. You share the outbound stretch with the 25K, and the ground there moves by only a few metres. The waves are short, and none lasts long enough to break your stride.
The only rise worth the name sits in the turnaround loop. From kilometre 2.2 the trail climbs gently for just over 300 metres, then drops straight back. Nowhere do you gain more than eleven metres in one go. For the 25K this spot is the opening of the first long climb; for you it is already the highest point of the race.
The way home offers something the way out did not: you already know every wave. The roughly 46 metres of ascent come in many small pieces, and nothing is steeper than 5 percent. As a trail race it still asks for more attention to each footfall than an equally flat road race, and that difference is what gives this short race its character.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 2.2 | 0.3 km | 3.5 % | 5 % | +11 m | — |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
With almost nothing forcing you to walk or brake, the 5K is a race right at threshold from the first minute, and speed comes from evenness. Take the low waves of the way out at equal effort rather than equal speed: slightly slower up, relaxed down, attacking none of them.
The race is decided between kilometres 2.2 and 3. The turnaround loop delivers its small rise just as the effort starts to burn, and the trail falls away directly behind it. Stay calm at the top and use the drop to accelerate, and the way home will be quicker than the way out.
The trap is the flatness itself. The first kilometre is so level that it tempts you into a pace you cannot hold through the loop. Instead, pick out a landmark on the way out about two kilometres from the finish: your final push starts there, not earlier.

Age-group athletes will spend about 25 to 40 minutes on this course. That is a sustained hard effort near threshold on an aerobic base, with few anaerobic spikes, because apart from the short waves and the rise in the turnaround loop the route forces no changes of pace.
Tempo work is therefore the core of the preparation: repeats of 800 to 1,000 metres at target race pace, plus longer threshold runs that teach you to stay under tension for a long time. Short pick-ups on a gentle hill of about 300 metres round this out. They mirror the one moment where the race tips, and above all they rehearse shifting back into running pace over the crest.
Some of these sessions belong on trail rather than the track. The pace will be lower than on tarmac, but you learn to hold a quick stride on uneven ground, which is what separates this course from a road 5K of the same length. Running slightly downhill at a fast cadence is worth practising too, because the stretch behind the turnaround loop is your best chance of gaining time.
With the race on 22 May, the sharp phase of your preparation falls in spring. In the final weeks, run a five-kilometre test on an out-and-back route with a turning point. It shows how much pace you can spend on the first half without paying for it on the way home.

Download the Mission Trails Twilight Runs course as a GPX file for your watch or bike computer.
Ben connects your goal, the course, current load, recovery, and calendar. Your plan stays pointed at race day even when real life is not perfectly plannable.
Mission Trails Twilight Runs is 5 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
Mission Trails Twilight Runs has around 46 m of elevation gain over 5 km. That affects pacing, muscular load, and preparation for late-race sections.
Mission Trails Twilight Runs is classified as Rolling, averaging 9.1 vertical metres per kilometre. 30% of the route is flat, 34% climbs moderately (2 to 6%) and 0% is steeper than 6%.
The hardest climb of Mission Trails Twilight Runs starts at kilometre 2.2, runs for 0.3 km at an average of 3.5% and gains 11 metres.
Yes, Mission Trails Twilight Runs is laid out as a loop: start and finish are in the same place.
Yes. The Mission Trails Twilight Runs course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
Preparation for Mission Trails Twilight Runs should account for 5 km, 46 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
The pacing strategy for Mission Trails Twilight Runs should reflect 5 km, 46 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
Mission Trails Twilight Runs 2027 takes place on May 22, 2027.
Mission Trails Twilight Runs 2027 takes place in San Diego, United States.
Mission Trails Twilight Runs offers 3 distances — 5K: 5 km; 25K: 25 km; 50K: 50 km.
Registration runs through the organiser: enduranceraceseries.com. YOUB shows you the course, elevation profile and training plan for your preparation.