Snowdonia Half Marathon
Llanrwst, United Kingdom · Sunday 9 May 2027
Difficulty Calculator
Adjusted Time
2:01:57
Time difference: +17.0 minutes compared to an average road half marathon.
Course Details
Typical Race-Day Weather
Average for this date over the last 8 years.
Snowdonia Half Marathon course route, from the mapped course on GoAndRace.
How hard is Snowdonia Half Marathon?
On our difficulty model, Snowdonia Half Marathon plays about 13 minutes slower than an average road half marathon for a 1:30 runner. It ranks #62 hardest of 650 half marathons we analyse, and #24 of 113 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Snowdonia 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 Snowdonia Half Marathon | Difference |
|---|---|---|
| 1:30:00 | 1:42:57 | +12:57 |
| 1:45:00 | 2:01:57 | +16:57 |
| 2:00:00 | 2:21:17 | +21:17 |
| 2:15:00 | 2:40:56 | +25:56 |
| 2:30:00 | 3:00:51 | +30:51 |
| 2:45:00 | 3:21:04 | +36:04 |
| 3:00:00 | 3:41:33 | +41:33 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Snowdonia Half Marathon 2027 Course Analysis
Snowdonia Half Marathon is a half marathon held in Llanrwst, United Kingdom. It is scheduled for Sunday 9 May 2027. The course is run on road surface with 559m of total climbing, with its high point near 317m above sea level. For registration and full race details, visit the official Snowdonia Half Marathon website.
Course map
Snowdonia Half Marathon is run as a loop: the course starts and finishes in the same place. The race map above shows the full route (21.1 km as mapped), with the start and finish.
Climbing
At 559m of total climbing, it is hillier than 98% of the 650 half marathons we rate. The hills will cost time: pace the climbs on effort, not on the watch.
Race-day weather
Over the last 5 years this May date has averaged a high of 15°C and a low of 9°C. That is cooler than 79% of the half marathons we track.
On 9 May over the last 5 years, the high ranged from 9°C (2019) to 20°C (2024), so pack for either. It rained on 3 of those 5 days.
| 9 May | High | Low | Rain | Wind |
|---|---|---|---|---|
| 2026 | 14°C | 8°C | 4 h | 16 km/h |
| 2024 | 20°C | 9°C | dry | 11 km/h |
| 2021 | 15°C | 10°C | 1 h | 31 km/h |
| 2020 | 20°C | 10°C | dry | 7 km/h |
| 2019 | 9°C | 7°C | 23 h | 14 km/h |
Daily weather for the race location (Open-Meteo archive). Wind is the day's peak.
Looking for an easier marathon or a tougher challenge? You can also compare Snowdonia Half Marathon against other half marathons to find the right race for your goals.
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