Chelmsford, United Kingdom · Sunday 12 October 2025
The Chelmsford Half Marathon is held in the town of Chelmsford, located in Essex, England. The race features a scenic route through the town center, parks, and the surrounding countryside. Runners enjoy views of Chelmer Park, Hylands House, and the River Chelmer. The course is mostly flat, with a few small hills along the way.\n\nAfter the race, participants can visit Chelmsford Museum and Essex Regiment Museum, enjoy a walk in Hylands Park, or explore Chelmsford’s historic town center. The town
Adjusted Time
1:41:19
Time difference: -3.7 minutes compared to a flat, road, temperate course.
Chelmsford Half Marathon is a half marathon held in Chelmsford, United Kingdom, scheduled for Sunday 12 October 2025. The course is run on road surface with 112m of total elevation gain, reaching a maximum altitude of 43m above sea level. For registration and full race details, visit the official Chelmsford Half Marathon website.
With 112m of elevation gain, this is a moderately undulating course. The route ranges from 19m to 43m above sea level (24m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.
Based on historical weather data for October, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 4°C to 15°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.
Chelmsford Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.
Our difficulty rating for Chelmsford Half Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based half marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.
Looking for an easier marathon or a tougher challenge? You can also compare Chelmsford Half Marathon against other half marathons to find the right race for your goals.
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