
Eureka, United States of America · Monday 9 August 2027
Held in August in Eureka, the Humboldt Bay Marathon offers a flat to gently rolling course that won't punish your legs with climbing, making it a solid choice if you're chasing a time or testing fitness without major elevation battles. The course stays low overall, ranging between sea level and just above 50 meters, so what you see is what you get in terms of effort. August in coastal Northern California means you should prepare for variable weather, potentially cool and damp conditions typical of the region. The race is road-based, so you'll be on pavement the whole way, which is good for your pace but worth noting if you prefer trail variety. Check the official race website closer to 2026 for start time, course specifics, and entry details, since logistics for a relatively smaller marathon can vary year to year.
Adjusted Time
3:51:05
Time difference: -8.9 minutes compared to a flat, road, temperate course.
On our difficulty model, Humboldt Bay Marathon plays about 3 minutes faster than an average road marathon for a 3:30 runner. It ranks #1112 hardest of 1150 marathons we analyse, and #553 of 575 in United States of America. Use the calculator above to see the exact adjusted time for your own goal pace.
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Humboldt Bay Marathon | Difference |
|---|---|---|
| 3:00:00 | 2:53:13 | −06:47 |
| 3:30:00 | 3:22:13 | −07:47 |
| 4:00:00 | 3:51:05 | −08:55 |
| 4:30:00 | 4:19:50 | −10:10 |
| 5:00:00 | 4:48:27 | −11:33 |
| 5:30:00 | 5:16:59 | −13:01 |
| 6:00:00 | 5:45:24 | −14:36 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Humboldt Bay Marathon is a full marathon held in Eureka, United States of America. It is scheduled for Monday 9 August 2027. The course is run on road surface with 0m of total climbing, with its high point near 51m above sea level.
This is a very flat course, with only 0m of total climbing and little change in altitude throughout. Flat profiles let you hold an even pace from start to finish, which makes this a fast, PB-friendly race.
Based on historical weather data for August, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 10°C to 17°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 (1%), so dry conditions are likely.
Humboldt Bay 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 Humboldt Bay Marathon against other marathons to find the right race for your goals.
If Humboldt Bay Marathon fits your goal, these courses play out about the same on our difficulty model.
United States of America
United States of America
United States of America
United States of America
United States of America
United States of America
Gulf Shores, United States of America
Gulf Shores, United States of America
Salmon, United States of America
Marquette, United States of America
Las Vegas, United States of America
Washington, United States of America