All courses feature a wide variety of typical desert trail running surfaces including crushed granite single track, rocks, boulders, sandy washes, old jeep roads, and dry wash beds. Be prepared for a wide variety of conditions from very well defined, to more remote and sandy. Course Photos

The course itself sits at the foothills of the virtually untouched, rugged, mountain range known as the Sierra Estrella Mountains that will provide some gorgeous backdrops throughout your journey. I guarantee at some point during this race you’ll be drawn to these peaks. You will mostly be running on rolling single and double track trails without any real substantial climbing in one shot. There is a 1.5-2 mile section on the back half of the course named the Corgett Wash and can be very sandy depending on the weather leading up to the race. This is a great race to consider gaiters because of this.

Hiking/trekking poles are not quite as useful but are allowed.

A couple other points to consider with this race (more specifically 100M and 100K runners):

1. Keep in mind that we can have some pretty dramatic temperature swings from day to night (30-40 degrees). You may be running through the day with a headwrap on to protect yourself from the heat (see: zero shade cover) and then bundling up to stay warm through the late parts of the night. I know, 40 degrees is nice where you’re coming from this time of year. Trust me, it’s a cold 40 degrees here and running in and out of the washes on course you’ll understand.
2. As it is the middle of winter, there will be a long period of night time running. Do not get caught out on the trail between aid stations without a headlamp! Bring an extra and be prepared to run through the night from 6pm until after 7am. You will begin your race just as civil twilight hits the horizon so it’s possible to start your race sans headlamp but it’s your call- you’ll be on a trail 100 yards into the race. 
3. For those of you joining us after running the Javelina Jundred 100 miler in October, you’ll see there are two additional hours to finish for Coldwater. The terrain is more technical, the night longer, and we want you to finish this thing. Keep Going.

100K : Red, Blue, Blue

Crews are welcome to support runners near the start/finish line located at the Competitive Track.  This will serve as the “Rumble Headquarters” for the duration of the 32 hour event! Crew canopies are welcome along the course where the runners come through every lap.

Crews will also be allowed at Coldwater Ranch Aid, but structures cannot be set up, and there is no camping.

Pacers may join 100K runners for their final Blue loop of the race.

A drop bag will be allowed at the Rumble HQ (start/finish line) for all distances and at Coldwater Ranch Aid for 100 Mile, 100K, 60K and 40K runners.

Cut-Offs
Note: mid-race cutoffs are for leaving aid stations, not arriving.

Runners must start their final Blue Loop by 6:00AM on Sunday morning. 
The final cutoff for the race is 3:00PM on Sunday afternoon. 

All courses feature a wide variety of typical desert trail running surfaces including crushed granite single track, rocks, boulders, sandy washes, old jeep roads, and dry wash beds. Be prepared for a wide variety of conditions from very well defined, to more remote and sandy. Course Photos

The course itself sits at the foothills of the virtually untouched, rugged, mountain range known as the Sierra Estrella Mountains that will provide some gorgeous backdrops throughout your journey. I guarantee at some point during this race you’ll be drawn to these peaks. You will mostly be running on rolling single and double track trails without any real substantial climbing in one shot. There is a 1.5-2 mile section on the back half of the course named the Corgett Wash and can be very sandy depending on the weather leading up to the race. This is a great race to consider gaiters because of this.

Hiking/trekking poles are not quite as useful but are allowed.

A couple other points to consider with this race (more specifically 100M and 100K runners):

1. Keep in mind that we can have some pretty dramatic temperature swings from day to night (30-40 degrees). You may be running through the day with a headwrap on to protect yourself from the heat (see: zero shade cover) and then bundling up to stay warm through the late parts of the night. I know, 40 degrees is nice where you’re coming from this time of year. Trust me, it’s a cold 40 degrees here and running in and out of the washes on course you’ll understand.
2. As it is the middle of winter, there will be a long period of night time running. Do not get caught out on the trail between aid stations without a headlamp! Bring an extra and be prepared to run through the night from 6pm until after 7am. You will begin your race just as civil twilight hits the horizon so it’s possible to start your race sans headlamp but it’s your call- you’ll be on a trail 100 yards into the race. 

60K : Red, Blue

Crews are welcome to support runners near the start/finish line located at the Competitive Track.  This will serve as the “Rumble Headquarters” for the duration of the 32 hour event! Crew canopies are welcome along the course where the runners come through every lap.

Crews will also be allowed at Coldwater Ranch Aid, but structures cannot be set up, and there is no camping.

There are no pacers allowed for any other distance other than the 100 Mile and 100K.

A drop bag will be allowed at the Rumble HQ (start/finish line) for all distances and at Coldwater Ranch Aid for 100 Mile, 100K, 60K and 40K runners.

All courses feature a wide variety of typical desert trail running surfaces including crushed granite single track, rocks, boulders, sandy washes, old jeep roads, and dry wash beds. Be prepared for a wide variety of conditions from very well defined, to more remote and sandy. Course Photos

The course itself sits at the foothills of the virtually untouched, rugged, mountain range known as the Sierra Estrella Mountains that will provide some gorgeous backdrops throughout your journey. I guarantee at some point during this race you’ll be drawn to these peaks. You will mostly be running on rolling single and double track trails without any real substantial climbing in one shot. There is a 1.5-2 mile section on the back half of the course named the Corgett Wash and can be very sandy depending on the weather leading up to the race. This is a great race to consider gaiters because of this.

Hiking/trekking poles are not quite as useful but are allowed.

A couple other points to consider with this race (more specifically 100M and 100K runners):

1. Keep in mind that we can have some pretty dramatic temperature swings from day to night (30-40 degrees). You may be running through the day with a headwrap on to protect yourself from the heat (see: zero shade cover) and then bundling up to stay warm through the late parts of the night. I know, 40 degrees is nice where you’re coming from this time of year. Trust me, it’s a cold 40 degrees here and running in and out of the washes on course you’ll understand.
2. As it is the middle of winter, there will be a long period of night time running. Do not get caught out on the trail between aid stations without a headlamp! Bring an extra and be prepared to run through the night from 6pm until after 7am. You will begin your race just as civil twilight hits the horizon so it’s possible to start your race sans headlamp but it’s your call- you’ll be on a trail 100 yards into the race. 
   
   40K: Blue Loop with a more direct route from Dysart to Coldwater Ranch Aid

Crews are welcome to support runners near the start/finish line located at the Competitive Track.  This will serve as the “Rumble Headquarters” for the duration of the 32 hour event!

Crews will also be allowed at Coldwater Ranch Aid, but structures cannot be set up, and there is no camping.

There are no pacers allowed for any other distance other than the 100 Mile and 100K.

A drop bag will be allowed at the Rumble HQ (start/finish line) for all distances and at Coldwater Ranch Aid for 100 Mile, 100K, 60K and 40K runners.

All courses feature a wide variety of typical desert trail running surfaces including crushed granite single track, rocks, boulders, sandy washes, old jeep roads, and dry wash beds. Be prepared for a wide variety of conditions from very well defined, to more remote and sandy. Course Photos

The course itself sits at the foothills of the virtually untouched, rugged, mountain range known as the Sierra Estrella Mountains that will provide some gorgeous backdrops throughout your journey. I guarantee at some point during this race you’ll be drawn to these peaks. You will mostly be running on rolling single and double track trails without any real substantial climbing in one shot. There is a 1.5-2 mile section on the back half of the course named the Corgett Wash and can be very sandy depending on the weather leading up to the race. This is a great race to consider gaiters because of this.

Hiking/trekking poles are not quite as useful but are allowed.

10 Mile (Red Loop)

Crews
Crews will be allowed at the start/finish.

Pacers
There are no pacers allowed in the 10 Mile.

Drop Bags
May be left at Rumble HQ (start / finish area)

All courses feature a wide variety of typical desert trail running surfaces including crushed granite single track, rocks, boulders, sandy washes, old jeep roads, and dry wash beds. Be prepared for a wide variety of conditions from very well defined, to more remote and sandy. Course Photos

The course itself sits at the foothills of the virtually untouched, rugged, mountain range known as the Sierra Estrella Mountains that will provide some gorgeous backdrops throughout your journey. I guarantee at some point during this race you’ll be drawn to these peaks. You will mostly be running on rolling single and double track trails without any real substantial climbing in one shot. There is a 1.5-2 mile section on the back half of the course named the Corgett Wash and can be very sandy depending on the weather leading up to the race. This is a great race to consider gaiters because of this.

Hiking/trekking poles are not quite as useful but are allowed.

5 Mile

There is no on-course aid on the 5 Mile course. Be sure to come prepared with ALL the water you will need for the entirety of the loop. There will be a fully stocked aid station at Rumble HQ when you cross the finish line.

Crews
Crews will be allowed at the start/finish.

Pacers
There are no pacers allowed in the 5 Mile.

Drop Bags
May be left at Rumble HQ (Start / Finish area)