Three Forts Half Marathon
Worthing, United Kingdom · Tuesday 4 May 2027
The Three Forts Marathon (which also has a half marathon option) is a trail running event held in Sussex, England, known for its challenging course and historic landmarks. The course takes runners along the South Downs Way, a scenic trail that passes three ancient Iron Age hill forts. Participants can expect significant elevation changes and varied terrain, making it suitable for experienced trail runners.
Difficulty Calculator
h
:m
:s
Adjusted Time
1:58:56
Time difference: +13.9 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain497m
Elevation High230m
Elevation Low21m
Weather Forecast
High14°C
Low7°C
Chance of Rain0%
How hard is Three Forts Half Marathon?
Difficultharder than 86% of half marathons
Flattest / easiestHardest
On our difficulty model, Three Forts Half Marathon plays about 13 minutes slower than an average road half marathon for a 1:30 runner. It ranks #63 hardest of 450 half marathons we analyse, and #22 of 89 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Three Forts Half Marathon?
Estimated finish times on this course versus the same effort on an average road half marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Three Forts Half Marathon | Difference |
|---|---|---|
| 1:30:00 | 1:40:34 | +10:34 |
| 1:45:00 | 1:58:56 | +13:56 |
| 2:00:00 | 2:17:35 | +17:35 |
| 2:15:00 | 2:36:29 | +21:29 |
| 2:30:00 | 2:55:39 | +25:39 |
| 2:45:00 | 3:15:02 | +30:02 |
| 3:00:00 | 3:34:39 | +34:39 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Three Forts Half Marathon 2027 Course Analysis
Three Forts Half Marathon is a half marathon held in Worthing, United Kingdom. It is scheduled for Tuesday 4 May 2027. The course is run on road surface with 497m of total climbing, with its high point near 230m above sea level. For registration and full race details, visit the official Three Forts Half Marathon website.
Elevation Profile
This is a hilly course with 497m of total climbing, rising to around 230m above sea level. It pays to train on hills and to pace the climbs conservatively.
Expected Race Day Weather
Based on historical weather data for May, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 7°C to 14°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a low chance of rain (0%), so dry conditions are likely.
Surface Type: Road
Three Forts Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare Three Forts Half Marathon against other half marathons to find the right race for your goals.
Half marathons of similar difficulty
If Three Forts Half Marathon fits your goal, these courses play out about the same on our difficulty model.
Other Half Marathons in United Kingdom
Run the Blades Half Marathon
Eaglesham, United Kingdom
Road178m gainJuly 2026
Dundee Half Marathon
Dundee, United Kingdom
Road127m gainJuly 2026
Ilkley Half Marathon
Ilkley, United Kingdom
Road206m gainJuly 2026
Richmond Park 5k, 10k and Half Marathon - July
London, United Kingdom
Mixed209m gainJuly 2026
Richmond Park Half Marathon - August
London, United Kingdom
Mixed209m gainAug 2026