Registration closes: Mon, May 31 @ 11:59PM




Due to concerns about the Coronavirus/COVID-19 and corresponding state-wide mandates regarding events, there will be no 2021 in-person Cottontail 6- & 12-Hour. As with Carkeek and Sasquatch this past fall, however, we're excited to safely offer a virtual option. If you were registered for one of the events last spring that needed to be canceled, you should see a rollover credit when you register; if you run into any trouble during registration, please email to let us know. Thank you for understanding, we'll be sending all sorts of virtual mojo your way this year, and we'll look forward to seeing you in person again next year!


2021's 7th! annual event will be a virtual event, running from April 1st to May 31st—two whole months in which you can choose your challenge of choice. [Hop to it on your local trails, with a bonus prize for whoever can best simulate a course like Cottontail!]

With gorgeous views of the Sound, varied terrain (rolling trails, steep stairs, a section or two that might generously be called “flat”), and a festive atmosphere, we think this is a race you (and your family, and friends, and well-behaved, leashed dogs) will just keep coming back to—one 1.93-mile lap at a time. Run for twelve hours, run for six. Run as few or as many hours as you like! Every single runner will get something awesome simply for showing up to run, but this isn't your typical medal-laden sort of endeavor. (We hand-make our bibs, count your laps with star stickers, and the first time we directed this race, winners won giant stuffed dragons. Last year, winners won a variety of things, including bright pink and/or green garden gnomes.)

In addition to being heaps of F-U-N, our races are also low-impact: You won’t find any paper products at the Cottontail 6- & 12-Hour, and we strive to have less than one full bag of trash at day's end. We also avidly support local businesses, which means as much aid (and prizes!) as possible will come from local businesses. Speaking of aid, we'll have some of the best out there. We'll bring you awesome fuel as your legs run loop after epic loop, and we'll have great, locally-sourced prizes to raffle off throughout the day, too. We also provide re-usable mugs for you to use throughout the day, though if you have a favorite coffee mug, you're of course welcome to bring your own. We'll have awesome and super talented local photographer Glenn Tachiyama out on the course while you're rocking epic loops, too, and you'll have the ability to purchase gorgeous prints of your ambitious Carkeek endeavors from Glenn, post-event.


This isn't your average loop race. Cottontail is run on a clockwise, 1.93-mile loop in Seattle's gorgeous and rugged Carkeek Park, with an additional .54-mile loop open most of the day to give you more distance options and keep things fresh. You're welcome to run as few or as many loops as you'd like during your 6- or 12-hour stay with us, but here's what to expect on each loop: steep stairs, rolling trails, gorgeous vistas, loads of singletrack, green trees, glorious ferns, spring flowers, lots of up and lots of down. These loops might be short, but they're never going to feel that way. Each loop contains 436' of vertical gain, which adds up QUICKLY, so expect to (have fun, yes!, and) be challenged.

We promise at the end of your day you'll feel proud of yourself, no matter how many miles you run. (We promise we'll be proud of you, too.)


Start & finish beside Puget Sound, in Carkeek Park. 7 AM to 7 PM.

For the 12-Hour and the 6-hour morning crew, gates to the park open at 6:30 AM, which is when check-in starts. The run begins at 7 AM.

For the 6-Hour afternoon crew, check-in starts at 12:30 PM and the run begins at 1 PM. (6-hour runners can also elect to start at 7 AM with the 12-hour folks, but be sure to sign up for the 6-hour AM registration if you'd prefer that option!)

For both races, expect pre-race announcements just a few minutes before the start. The 6-hour AM race ends at 1 PM, and both the 12-hour and 6-hour PM races finish at 7 PM—any laps finished after that time will not be counted toward your day's total. [By April, we'll have longer days to work with, so you shouldn't need headlamps for any portion of the run unless you want it for the first or last laps of the day.] Our timed events are intentionally small, with typically no more than 50 runners running at time, and feel a lot more like a supportive gathering of zany friends more than a race. (We like our races cozy, low-key, and low-impact). :)

All other pertinent info will be emailed to registered runners a few days before race-day!


The 6-Hour run starts at a friendly $50 (+ applicable sales tax & UltraSignup processing fees), and the 12-Hour at an equally friendly $70 (+ applicable sales tax/US fees). We'll keep that "Early Bird" pricing open through December 31st, and then prices will jump up slightly January 1st, and then again for the final time April 1st.

This race, like Carkeek in the fall, is an Endless Trails fundraiser, so any and all funds that don't go to race-related costs (including awesome aid and prizes) will go to our 501(c)3 nonprofit to support trail work, trail education, and trail advocacy throughout the Northwest region. We'll be accepting cash and check donations on the day of the event, too, and you'll also have the option to make an additional tax-deductible donation to Endless Trails as you're registering. Every little bit helps, and all of it goes back to good and much-needed work on local and beloved Northwest trails. Thanks for your support! #RunningForTrails


Like we've offered for our Cottontail & Carkeek events in the past, this year we're offering a way for you to knock $15 off the registration price of either the 12-hour or the 6-hour.

Just email us at and sign up to bring a tasty aid station food and/or drink to share with your fellow runners (we keep these events intentionally small, so we're not talking huge quantities here), and we'll give you a code that'll discount $15 off your race entry when you go to register. We always try to have some of the best aid station food around, but we also always try to keep things simple (nuts; wraps; homemade soup; fruit, etc.). You can make a local farmer's market stop, and/or grab something you love from Costco/Safeway/your pantry, or you can even bring something homemade!

We'll keep a master list of stuff folks are planning to bring, and might even ask you to bring something specific, so we don't end up with too much of one good thing. And we'll keep offering discounted entries as long as we need more aid station food and/or drinks—BUT PLEASE EMAIL US BEFORE YOU REGISTER if you'd like the discount.

If you don't want to worry about bringing something to share, no worries! Just register as usual and we promise we'll take good care of you.


Check the Cottontail race page (linked above) to see if it might already be answered there. If it's not, feel free to shoot us an email at allthetrails[at]gmail[dot]com.

Pre-race emails will go out to all registered entrants with all pertinent details a few days before race-day!

We're active on social media, too: You can find Endless Trails on Bookface, and we're @endless_trails on both Twitter & Instagram.

Looking forward to seeing you in April!

*Prices include US sales tax, but not UltraSignup fees; US fees applied at check-out. All registrations are non-refundable and non-transferable to other runners/events. All donations go to Endless Trails, a registered 501(c)3 nonprofit for trails.*

Local time: 12:59 AM


Linked Events

Ask a Question

Top Performances