Mermaid Half Marathon San Diego
San Diego, CA
- Half Marathon, 10K, 5K, Kids Run
- Road (Paved)
- Official race website
Mermaid returns to San Diego’s Mission Bay for a scenic women’s 5K, 10K, and half marathon. The flat and fast course features beautiful Bay views on mostly closed roads. The Mermaid is ideal for both runners and walkers. Come out and experience the joy of crossing the finish line! Mermaids … MORE
Local Historical Weather (Mar 14):
| 2026 | 2025 | 2024 | 2023 | 2022 | |
| H (°F) | 71 | 58 | 66 | 65 | 67 |
| L (°F) | 57 | 53 | 53 | 55 | 53 |
Find Nearby Lodging (hotel, rental, etc.):
Small race, flat course
Fun medal & optional necklace, course at local park with double lap around a small island, open course shared with lots of walkers & dogs & strollers, helpful pacer team MORE
Fun medal & optional necklace, course at local park with double lap around a small island, open course shared with lots of walkers & dogs & strollers, helpful pacer team
Magical
San Diego Mermaid Series is definitely on my top 5 races. I dressed up as a mermaid because it was very fitting for this race. The community and the people … MORE
San Diego Mermaid Series is definitely on my top 5 races. I dressed up as a mermaid because it was very fitting for this race. The community and the people were so generous and caring. I was the last one as usual but the whole crew waited on me. The cheers, the volunteers, the race coordinator and many other people waited for me to cross the finish line. There was not one but two sweepers that finished with me. Super down to earth ladies that encouraged me throughout the race and actually cared that I finish the race.
Mermaid Half Marathon
This would have been a beautiful race but who would think it would be one of the rainiest races I have ever run and it was in California! It was … MORE
This would have been a beautiful race but who would think it would be one of the rainiest races I have ever run and it was in California! It was kind of miserable but I love a challenge. Despite the awful weather the race went smoothly. The medal was nice and there were a lot of post race snacks. My shirt size was on back order but once it was mailed to me I loved it, very nice tank top. This truly is a beautiful course and really want to do it again without rain whipping in my face.
One More Time
I would do this race again. As far as small race productions go, it really like this one. The course is mild and the scenery in nice. If you wear … MORE
I would do this race again. As far as small race productions go, it really like this one. The course is mild and the scenery in nice. If you wear “mermaid” gear, pre-test the clothing so you don’t get chaffed. These Mermaid athletes are fit, so its a great experience to run with them .
Fun Run
This is a smaller run that I anticipated. There were only 300 people running the whole half marathon. I enjoyed the location, T9 and Mermaid Series, but I would probably … MORE
This is a smaller run that I anticipated. There were only 300 people running the whole half marathon. I enjoyed the location, T9 and Mermaid Series, but I would probably do the 10K or their trail run next time.
Meh
Paved course from road to sidewalk. Starts near Sea World goes into park. Bib pickup was easy. Parking was a breeze. Wasn’t much to see. Medal/shirt was ok. Nothing really … MORE
Paved course from road to sidewalk. Starts near Sea World goes into park. Bib pickup was easy. Parking was a breeze. Wasn’t much to see. Medal/shirt was ok. Nothing really noteable either way~good or bad.
Fun and easy run!
This is a very easy run, recommend to those that are running their first half marathon! I had a lot of fun running this half, will def. do it again! MORE
This is a very easy run, recommend to those that are running their first half marathon! I had a lot of fun running this half, will def. do it again!
Fun, female friendly atmosphere!
This is a small, women's oriented run with a nice shirt and medal and super cute mermaid necklace! I think I saw maybe a half dozen men running (though they … MORE
This is a small, women’s oriented run with a nice shirt and medal and super cute mermaid necklace! I think I saw maybe a half dozen men running (though they are more than welcome!)
The course is fairly simple. Easy and flat. First part is Fiesta Island (not very ‘party’, ha!) … it’s actually pretty desolate though it is all along the water. Then it runs thru the park, past the finish area and thru some neighborhoods. I did notice toward the end the mile markers were quite off and the course was 0.3 short on my watch (typically courses are a bit over since no one runs perfect tangent; very rare for a course to be short).
Overall, this is a nice race. Not frills as far as swag or food though the necklace is a nice touch.
Cute, fun, & simple run with views
This race has some great scenery all throughout, from start to finish. We start at the Shores near Sea World and make our way all around Fiesta Bay with panoramic … MORE
This race has some great scenery all throughout, from start to finish. We start at the Shores near Sea World and make our way all around Fiesta Bay with panoramic water views every step of the way. The only residential area is a few miles later in the course, and even that is a great time, as many locals come out on their lawns to party, cheer, and offer mimosas 🙂 One issue was that the last three mile markers were misplaced, so one mile seemed much longer than it was, while the last mile was much shorter to make up for the incorrect placement of the previous mile. This is a huge issue for a pacer, which I was for the three hour group. The finish, at a different set of Shores, was picturesque, and we received a lovely mermaid necklace. Adorable race worth it.