The 2018 Cool Earth 5K will take place on April 22nd, 2018 (Earth Day) at Princeton University.

About the Race

DATE: April 22nd, 2018 (Earth Day!) at 3:00pm. Please arrive between 2:00-2:40pm for bib pickup or onsite registration!

COURSE START: Dillon Gym, Princeton University

WHO CAN PARTICIPATE: Anyone! We especially welcome community members and furry friends.

Our registration fee is a $5 or more donation* to Cool Earth, our charity partner. Those who register and donate online will get a free t-shirt (supplies may be limited based on registration time due to final budget determinations) and entry for our many raffle prizes!

*Princeton University undergraduates can register without a donation, but only those who donate $5 or more will receive a t-shirt and be eligible for the raffle

Click here to register online!

About Cool Earth

Cool Earth aims to reduce the impacts of climate change by combating deforestation in a variety of rainforest locations around the world, including in South America, Congo-Kinshasa, and Papua New Guinea.

Cool Earth does not buy rainforest directly, but rather establishes sustainable agreements with local communities to ensure that local communities opt not to sell the nearby forest to loggers. These agreements improve the lives of these communities to the point where they can withstand pressure to sell to loggers, and involve development of local industries such as cacao and coffee, technical assistance, funding for local schools, provision of boats for emergency health evacuations, and targeted maternal healthcare.

Outside charity evaluation organizations estimate that Cool Earth reduces CO2 emissions by $0.38/tonne, making it one of the most cost-effective climate change mitigation charities out there.

Learn more at Cool Earth's website.

CE5K's Partnership Statement with Cool Earth


Top finishers

We'll have prizes for the top 5 male and female finishers, as well as the top 5 finishers 18 and under.

Raffle prizes

Thanks to the generosity of local businesses, all participants who donate $5 or more as part of registration are entered to win gift cards, gear, and so much more. You don't even need to finish the race!

Furry friends

All participants who run/walk with their pet are eligible for a special prize (while supplies last)!

T-shirts for everybody

While supplies last, but we bought a ton! Check out what they look like here.


  • HOSTED BY: Princeton Conservation Society
  • DEPARTMENTAL SPONSOR: Princeton University Geosciences
  • INSTITUTIONAL SPONSOR: Princeton Environmental Institute
  • SPONSOR: USG Projects Board
  • LOCAL AND COMMUNITY PARTNERS: Wegmans Princeton, Whole Foods Princeton, the bent spoon, Princeton Running Company, REI Princeton

If you're interested in sponsoring the Cool Earth 5K, please reach out to us at [email protected]! We're mostly looking for in-kind donations toward race operations and prizes.


This race is timed! Results will be posted within 24 hours of the event on this website.

Our race (everything from t-shirt production and delivery to food) is carbon neutral.

Water, Gatorade, and food will be available at the start/finish. Water and Gatorade will also be available at a station halfway through the course.

Bag check will be available, but please bring your own reusable bag (and water bottle as well!).

We hope you consider walking or taking public transit on Earth Day, but parking is available in most numbered on-campus lots as well as on Nassau Street. We recommend Lot 8, across from the Princeton University Store on University Place.

For questions or comments, please contact us at [email protected].