We have changed venues due to parking issues at Ride To Walk. Please read all information. New location is Sunset Whitney Recreation Area 4201 Midas Ave, Rocklin, CA 95677
This year is "Save the Planet" year. We have a ton of merch from previous years, so you will be able to pick your own hat, buff, etc, while supplies last. We have reduced our entry fees 20%! You save money, we clean out the swag locker, and we don't add more swag to the planet.
"Well Organized, great course. The timing was superior. I liked being able to see where I was every time I crossed the timing mat." "The lap distance was perfect and the view was incredible." See full reviews at Our reviews page.
100 mile or 6, 12, 24 and 48 hour runs over a 1.1 mile loop in a quiet and beautiful recreation area.
100 Mile runners will have the full 48 hours to finish- but choose carefully, as we will not move you into the 48hr if you drop. It's just not fair to the 48 hour competitors to have someone fall out of the sky and knock them down in the standings. DNF's will happen in the 100, so if you are in doubt, consider the 48hr event.
See thunderultras.com for full details and reviews!
Just click "Register" and select your distance of choice. You will be asked for your preferred start time during the registration process.
48 hour begins 9am Saturday, and ends 9am Monday
100 mile run begins at 9 on Saturday and ends 9am Monday.
24 hour run begins at 9am on Saturday and 9am Sunday
12 hour run has three start times: 9am Saturday, 9pm Saturday, 9am Sunday
6 hour run has three start times: 9am on Saturday, 9pm on Saturday,and 9am on Sunday
All races with multiple start times will be consolidated into a single event per distance for results. For example, all three 12 hour events will combine into a single 12 hour, with one male and one female winner.
Pacers will be allowed in the 100 mile event, and from sunset to sunrise in the 24 and 48 hour events.
Based on capacity of the loop, we will limit the total number of pacers to 30, on a first-registered, first-served basis.
You will be asked during registration if you will be bringing a pacer. We will monitor and shut off pacer requests after 30 spots have been filled across ALL races. Please only register a pacer if you are relatively sure you are bringing one, otherwise you may take a spot from someone else.
Register early. You will get the lowest entry fee, and be guaranteed a bib for your pacer.
Pacers may eat and drink from the aid station. You will be given one pacer bib. You may rotate pacers, but only one out at a time.
If you are not given a pacer, family and friends may accompany you for the occasional lap. Do not abuse this, please.
Let us set up and tear down for you. Just show up and run. We have a limited number of tents, sleeping bags, tables, and chairs available to rent. All gear will be new to newish, and clean. First-come, first-served, and when they are gone, they are gone- so get in early if you want one. All rentals are good for the full 48 hours.
Small Tent- $29
> with one sleeping pad- $49
Large Tent- $79
> with two sleeping pads- $129
Sleeping bag- $33 each
Personal Folding Table- $30 each
Folding Chair- $12 each
Sunset Whitney Recreation Area 4201 Midas Ave, Rocklin CA 95677
Race for Free!!!!!
Volunteers who work six hours will receive free entry into any race this year or next. Limited spots are available. You MUST show up, and stay the whole shift.
Friday night from 5-9pm
Saturday, beginning at 7am.
Later races can just show up at least 45 minutes prior to your event and check in at the aid station.
The world famous Mike Melton from MCM timing will take care of lap counting for us with redundant timing chips, mats, and live runner tracking and updates. Mike's yearly resume includes Across The Years and A Race For The Ages, among other huge events. Please return your transponder when you finish your race. There will be a $20 charge for lost transponders.
We will have one aid station at the start\finish line stocked with the usual ultra goodies: We will provide a "real" food option around dinner time, and breakfast time.
WE ARE A CUPLESS EVENT. Please bring your own cup or bottle, which you may leave at the aid station, or your personal aid station. We will be happy to fill your bottle for you. Just tell us what you want, and we will have it ready for you the next lap. Please write your name on your bottles or cups.
This year is "Save the Planet" year. We have a ton of merch from previous years, so you will be able to pick your own hat, buff, etc. We have reduced our entry fees 20%! You save money, we clean out the swag locker, and we don't add more swag to the planet.
Each runner will receive a Thunder Ultras trucker hat, and finisher's medal. Runners completing 100 miles in any race will receive a custom 100 mile buckle. We may have some other surprises for you as well.
Awards for the top male and female finishers in each distance
Entry Fees: (Discounted 20%!!)
Please note: there will be a $30 surcharge for any registrations after Tuesday, 9/19/23. While we can appreciate waiting until the last minute to make sure there aren't any unforeseen issues, last-minute registrations put a burden on us, as we are trying to set up the event and are constantly being pulled to process registrations. We would love to have you, and will take you up until five minutes before the race, just know that there will be a premium for doing so.
Event's current local time: 8:32 AM PT
48 hour- $192 until March 31st, $216 after ($270 starting 9/20/23)
100 Mile- $152 until March 31st, $168 after ($192 starting 9/20/23)
24 hour- $136 until March 31st, $160 after ($184 starting 9/20/23)
12 hour- $80 until March 31st, $96 after ($120 starting 9/20/23)
6 hour- $56 until March 31st, $72 after ($96 starting 9/20/23)