Register for the 2017 The Happiest Fun Run on Earth!

The Happiest Fun Run on Earth Costume Run is the place to be on September 30, 2017!   

Whether you are a serious runner getting ready for a longer race or first time race entrant, we have a race distance for everyone - 10K, 5K, or 1 Mile Fun Run!   

Costumes welcome and encouraged! 

Open to all ages and abilities 

The 10K starts at 8:00 am

The 5K starts approximately 8:15am

The Fun Run starts approximately 8:45am


  • 10K (pending certification) and 5K USATF certified single loop course through beautiful residential area with rolling foothills. 
  • All runners must be able to complete the chosen course by 10:00am 
  • All run participants receive a cotton race T-shirt (Register early!  Late entrants or race day entrants are not guaranteed a T-shirt) 
  • All Fun Run participants receive a medal 
  • Post race snacks included with entry fee, and food for purchase 
  • Music, magician, pony rides and more at the festival after the Fun Run! 
  • iPod use is allowed 
  • Strollers are welcome - Please start at the rear of the starting area 
  • Please no pets on the race course 
  • Bag drop will be available near the race start; please use the bag provided, race numbers will be written on the bags left at the bag drop



Fun Run: $20 until September 23, Late entrant - $22 until September 30 

5K: $23 until August 21, $28 until September 23, Late entrant - $35 until September 30 

10K $35 until August 21, $40 until September 23, Late entrant - $47 until September 30 

Race day registration available at the course 

Group discounts available for teams of 10 or more - 


Potomac River Running Store - Fairfax, 11895 Grand Commons Ave, Fairfax, VA 22030 on Thursday, September 28 from 5-7 pm

St Andrew the Apostle Catholic School, 6720 Union Mill Rd, Clifton, VA on Friday, Sept 29 from 5-7 pm.

Race Day at St. Andrews, 
6720 Union Mill Rd, Clifton, VA, starting at 7 am

Packets will not be mailed 


Awards for the top three male and female overall 10K and 5K winners 

1st Place - $100 cash
2nd Place - $75 cash
3rd Place - $50 gift certificate 

1st Place - $75 cash
2nd Place - $50 cash
3rd Place - $50 gift certificate 

Awards for the top two male and female 10K and 5K by age category
Under 10
11-14 years
15-19 years
20-29 years
30-39 years
40-49 years
50-59 years
60-69 years
70+ years 

PARKING & START LINE: St Andrew the Apostle Catholic School, 6720 Union Mill Rd, Clifton, VA 

SPAGHETTI DINNER:  Carb up before the run! Pay at the Door Spaghetti Dinner on Friday, September 29. Spaghetti dinner is not included with race entry fee, $5 for individual/$25 for family. Dinner served from 5-7 pm at St. Andrews.  

PURPOSE: Formerly known as “Dash into the 80s”, this is the 10th annual run to benefit the school’s students.  Proceeds enrich the school’s academic programs, supplement the science program, improve athletic programs, increase technology in the classrooms, enhance library resources, and purchase art supplies.

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I know that running can be a hazardous activity and that I should not enter and run unless I am medically able and properly trained. I assume all risks associated with running, including, but not limited to, falls, weather conditions including high heat and/or humidity, contact with other participants, the effects of the road and traffic on the course, all such risks being known and appreciated by me. Having read this waiver and knowing these facts, I for myself and anyone entitled to act on my behalf, waive and release Potomac River Running, Inc., Potomac River Running Charitable and Educational Events Inc., Commonwealth Race Management, Inc., and all event partners, sponsors and volunteers, their representatives and successors from all claims or liability of any kind arising out of my participation in this race even though that liability may arise out of negligence or carelessness on the part of the persons named in this waiver. Further, I grant permission to all of the foregoing to use any photographs, motion pictures, or other record of this event for any legitimate purpose without compensation to me. For safety reasons, I agree not to officiate with any of the following: Wheelchairs, strollers, baby joggers, skates, pets or headsets. I understand that there are no refunds should severe weather cancel the event. I further understand that this event may change date or location if required by local authorities. I agree that my email address will be added to the Potomac River Running and Commonwealth Race Management email list.