A $45 Half Marathon on Fiesta Island — and the Price Goes Up Saturday

Overview

The Improve Every Day Half Marathon is Saturday, December 12, 2026, on Fiesta Island, and it costs $45.

That number is the entire story.

San Diego's established half marathons run well north of a hundred dollars — the La Jolla Half is currently $148.84 and climbs to $191.24 by race morning. There are good reasons for that: road closures, shuttles, expos, police, a point-to-point course.

This race doesn't do any of that, and charges accordingly.

You get a flat loop course on Fiesta Island, a 6 a.m. start, hydration stations, a finisher shirt and a post-race hang. No expo, no shuttle, no mandatory Friday. For a lot of runners — especially anyone who just wants a timed 13.1 in December without the production — that trade is exactly right.

And the deadline is this week: $45 becomes $55 after 11:59 p.m. on Saturday, October 31.

What's On Offer

• The Improve Every Day Half Marathon — $45. Rises to $55 after October 31
• The Improve Every Day 4 Miler — $25. Rises to $30 after October 31
• Virtual Half Marathon — $30. Registration closes November 29
• Virtual 4 Miler — $30. Registration closes November 29

Both in-person races start at 6:00 a.m., with a listed end time of 9:00 a.m.

The Course

It's a loop on Fiesta Island, and the structure is unusually simple:

• The 4 Miler is one full lap
• The half marathon is just over three laps of the same course

Fiesta Island is about as flat as San Diego gets — a loop road in the middle of Mission Bay, with water on both sides for most of it.

What a three-lap course means in practice, and it's worth thinking about before you enter:

• It's honest. You know exactly what's coming after the first lap, which makes pacing straightforward
• Aid is repeatable. You pass the same stations three times rather than meeting them once
• Spectators get three looks at you instead of a wave at the start and a wave at the finish
• It's mentally repetitive. If running the same four miles three times sounds grim, this isn't your race

A 6 a.m. December start on an exposed island in Mission Bay will be cold and dark. Plan layers you're willing to abandon.

What You Need to Know

• When: Saturday, December 12, 2026 · 6:00 a.m. start
• Where: Fiesta Island Road, San Diego — in Mission Bay
• Included: a lùth finisher shirt, hydration stations on course, and a post-race hang out
• Age range: the half marathon is listed as open to ages 1 to 110
• Refunds: "Refunds are not allowed for this race." No deferral or transfer policy is published
• Register through RunSignUp

Good to Know

• Register before Saturday. $45 to $55 is a 22% jump for waiting a week.
• The 4 Miler is a genuinely good entry point at $25 — one lap, same morning, same shirt situation, and you're done before seven.
• Fiesta Island is dark at 6 a.m. in December. Know how you're getting there and where you're leaving the car.
• There's no expo and no Friday obligation, which for a lot of people is the actual selling point.
• Check the race page for packet pickup before race week. It isn't published yet.

Why It's Worth It

Not every race needs to be an event.

The big San Diego halves are terrific and they cost accordingly — if you want closed roads, a shuttle, a crowd and a medal ceremony, the La Jolla Half Marathon in May is the one to train for.

This is the other thing. Forty-five dollars, flat laps, early start, home by nine. It's a race for people who want the distance and the timing chip and not much else — a December benchmark, a goal to hold a training block together, or a first half marathon without a three-figure commitment.

At $25, the 4 Miler is one of the cheapest organised races in the county.

For more of what's on, browse our full event calendar.