Miwok 100K 2027 Guide: Course, Aid Stations, Cutoffs and Cup Rules
Quick answer: The 31st Miwok 100K runs on Saturday, May 1, 2027, starting at 5:00 AM from the Stinson Beach Community Center in Marin County, California. The course is 62.2 miles with "11,501′ of elevation change," a 15 hour 30 minute limit set by park rules, and seven cutoffs, the tightest at Randall Trailhead (mile 49.2) by 5:10 PM. The race has been cupless since 2013, so bring your own cup. Registration for the 400 runner field opens November 7, 2026 at 6:00 AM on RunSignUp, and the race is a Western States 2028 qualifier.
Miwok 100K 2027 at a glance
| Item | Miwok 100K |
|---|---|
| Date and start | Saturday, May 1, 2027, 5:00 AM, no early starts |
| Start and finish | Stinson Beach Community Center, 32 Belvedere Ave, Stinson Beach, CA |
| Distance | 62.2 miles |
| Climbing | "11,501′ of elevation change" (course page); "over 11,000 feet of gain" (home page) |
| Time limit | 15 hours 30 minutes, finish by 8:30 PM |
| Field | 400 runners; relay limited to 20 teams of 4 |
| Entry | First come on RunSignUp from Nov 7, 2026, 6:00 AM, then a waitlist |
| Fee | $310 (relay $450 per team) |
| Qualifier | Western States 100 (2028) qualifying race |
From the race's official website and RunSignUp page, read October 12, 2026. The home page labels the start time PST, while RunSignUp says PDT. Runners who drop before February 1 get a $124 refund; bib transfers are a disqualification. The only shorter option is the four person relay.
The course
From Stinson Beach the course heads south over Cardiac and Muir Beach to Tennessee Valley and Bridge View, then turns back north through Tennessee Valley, Muir Beach and Cardiac. The second half is an out and back on Bolinas Ridge to Randall Trailhead before the return to Stinson Beach. The course page names trails including the Dipsea, Coastal Fire Road, Miwok, Marincello, Bobcat, Matt Davis and Bolinas Ridge, and landmarks such as Insult Hill and Pirates' Cove.
Two warnings from the course page are worth reading twice. On the technical Matt Davis Trail descent, watch for the sharp right-hand turn below the main trail. And fire road intersections are complex, so the race asks you to study the course map, which is published as a Strava route.
Aid stations and the gaps between them
| Mile | Aid station | Miles to next aid | Cutoff | Crew / drop bags / pacer |
|---|---|---|---|---|
| 2.8 | Cardiac Outbound | 5.2 | No aid outbound | |
| 8.0 | Muir Beach Outbound | 5.0 | No crew | |
| 13.0 | Tennessee Valley Outbound | 5.6 | 8:00 AM | Crew, drop bags |
| 18.6 | Bridge View | 7.4 | No crew | |
| 26.0 | Tennessee Valley Inbound | 4.3 | 11:00 AM | Crew, drop bags |
| 30.3 | Muir Beach Inbound | 5.2 | 12:00 PM | Crew |
| 35.5 | Cardiac Inbound | 7.0 | 1:30 PM | Full service, no crew |
| 42.5 | Bolinas Ridge Outbound | 6.7 | No crew | |
| 49.2 | Randall Trailhead | 6.7 | 5:10 PM | Crew, drop bags, pacers |
| 55.9 | Bolinas Ridge Inbound | 6.3 | 6:50 PM | No crew |
| 62.2 | Finish, Stinson Beach | 8:30 PM | Drop bags |
Cardiac has no aid on the way out, so your first refill is Muir Beach at mile 8.0. The longest gaps are Bridge View to Tennessee Valley (7.4 miles) and Cardiac Inbound to Bolinas Ridge Outbound (7.0 miles). Aid stations carry water, Roctane drink, GU gels and GU Liquid Energy, Coke, ginger ale and ultra snacks such as PB&J, chips, pretzels, pickles and fruit. Every station has a portapotty.
What to carry: Plan water by the time between refills, as in How Much Water Should I Carry Trail Running? With 7 mile gaps and a possible warm afternoon, two 500ml soft flasks is a sensible base. The ROOT5 comes with two 500ml soft flasks (1L total) and room for a phone, fuel and a light layer. If you want the recommended light jacket, sunscreen and more food on board, the ROOT8 has twin 500ml front flask pockets and more room for layers. Remember the cup as well: see What to Carry for a Cupless Trail Race.
Cutoffs
"Cutoffs are not linear," the race says, and "Our Randall Trail and Bolinas Ridge cutoffs are very tight to comply with the California State Park permit regulations." The chart works out to 3 hours to Tennessee Valley Outbound, 8 hours 30 minutes to Cardiac Inbound and 12 hours 10 minutes to Randall at mile 49.2. Leaving Randall at the cutoff leaves 3 hours 20 minutes for the last 13 miles, our calculation from the chart.
Required gear and rules
There is no formal mandatory gear list. What the race asks for:
- Your own cup: the race calls itself "a cup-less race" and asks you to bring your own cup for aid stations. The FAQ adds "there will be no paper cups available."
- A light for the start: "you'll need a headlamp or decent flashlight for the first 75 minutes." Valuable lights go in your Tennessee Valley drop bag, not the light box.
- Sunscreen and a light jacket are advised.
Pacers can join only at Randall Trailhead (mile 49.2) after signing a waiver, and "Pacers may not mule." Crews are allowed only at Tennessee Valley from 6:30 AM, Muir Beach after 7:00 AM and Randall all day, and "Any form of aid or crewing outside of "crew-yes" aid stations = DQ." Poles are allowed, but you must carry them from start to finish; none in drop bags and no handoffs. No littering, no course cutting, including switchbacks, and use the aid station bathrooms.
Weather and daylight
The race's own forecast: "Race day can be hot and sunny, cool and foggy, drizzling, torrential, muddy or a combination of ALL of the above!" For May 1, 2027 at Stinson Beach, the US Naval Observatory gives civil twilight at 5:46 AM, sunrise at 6:15 AM and sunset at 8:01 PM. That matches the race's 75 minutes of headlamp time after the 5:00 AM start, and the 8:30 PM final cutoff lands at the end of civil twilight.
Parking, check-in and drop bags
All participants must park in the Stinson Beach Park dirt lot, and cars on roadways or side streets will be towed. Carpooling is encouraged and the road in is narrow and winding. Bib pickup details for 2027 are not posted yet; the page still shows the 2026 race morning check-in of 4:00 to 4:45 AM. You must pick up your own bib with a valid ID. Drop bags go to Tennessee Valley, Randall and the finish, and Tennessee Valley bags come back to the finish by 2:30 PM. Spectators are strongly encouraged to cheer at Tennessee Valley.
Finishers receive a custom finisher's medal and a Miwok 100K sweatshirt.
FAQ
When does Miwok 100K registration open?
November 7, 2026 at 6:00 AM Pacific on RunSignUp. It is first come, with a waitlist once the 400 spots are gone.
Is Miwok cupless?
Yes, since 2013. Bring your own cup; there are no paper cups at aid stations.
What is the toughest cutoff?
Randall Trailhead at mile 49.2 by 5:10 PM, then Bolinas Ridge Inbound at mile 55.9 by 6:50 PM. The race calls these very tight.
Where can crews and pacers meet runners?
Crews at Tennessee Valley, Muir Beach (after 7:00 AM) and Randall. Pacers only from Randall.
Are poles allowed?
Yes, but you must carry them for the whole race.
Sources: miwok100k.com (home, registration, course, aid stations, crews and pacers, parking, bib pickup and rules pages), RunSignUp and the US Naval Observatory. Read October 12, 2026. LECAMO is not affiliated with the Miwok 100K.