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⏵ Course guide · SoCal timed ultra

Boundiful Endurance Runs Course Guide

Boundiful sends its field around a flat, 100% hardpacked dirt 1 mile loop through a Southern California fruit and nut farm in Hemet, with a 100 mile buckle option plus 24, 12, 6, and 3 hour timed races and a relay. There is no technical trail and almost no climbing here. The race is decided by pacing, fueling, and how well you handle the same mile over and over. I will walk you through the format first, then give you a pacing and fueling plan built for a flat, repetitive, all-day effort, plus free calculators to dial in your own numbers.

⏵ At a glance

Boundiful Endurance Runs quick facts

Date
Saturday, November 28, 2026 (10th annual)
Location
Washburn Ranch, Hemet, California (a fruit and nut farm)
Format
100% hardpacked dirt, 1 mile loop, chip timed with live web tracking
Distances
100 mile, 24 hour, 12 hour, 6 hour, 3 hour, plus a relay (2 or more runners)
Elevation
About 50 ft of gain per 1 mile loop, no gravel, asphalt, or pavement
Start
Saturday, 7:00 AM (check-in and bib pickup 6 to 7 AM)
100 mile buckle
31 hour cap: reach 80 miles within the first 24 hours and you earn 7 more hours to complete 100
Camping
Free on-course camping, Friday 4 PM through Sunday 4 PM

These facts come from the official race site and UltraSignup. Formats, cutoffs, and camping details can change year to year, so confirm the current specifics before you commit.

The loop and the format: where Boundiful is won and lost

Forget elevation charts. Every Boundiful format runs the same flat, wide, 100% hardpacked dirt 1 mile loop through Washburn Ranch, with about 50 feet of gain a lap. The race is really a contest of pacing discipline and fueling consistency across many, many repeats of that same mile.

The loop: flat, wide, and forgiving

There is no gravel, asphalt, or pavement anywhere on the course. It is 100% hardpacked dirt with smooth turns and ample room to pass, so congestion is not something you have to plan around even with the field spread across five different formats and a relay. That flatness is the whole draw: it removes the technical trail risk of a mountain ultra and lets your fitness and fueling decide the outcome instead of your footing.

The trade-off is the same one every looped race makes: the terrain will not break you, but the repetition can. Running the same mile dozens or hundreds of times asks for a different kind of toughness than a point-to-point trail race, and it rewards runners who can keep their effort and their eating steady long after the loop has stopped feeling new.

Pick your format: timed clock or the 100 mile buckle

The 3, 6, 12, and 24 hour races are straightforward: run until your clock expires and you get credit for however far you got. There is no distance cutoff to chase, only the clock. The 100 mile race works differently. Everyone gets an initial 24 hour window, and if you reach 80 miles inside it, you earn 7 more hours to complete the full 100, for a 31 hour overall cap. That built-in extension is squarely aimed at runners who have been burned by tight 100 mile cutoffs elsewhere.

Whatever you choose, everything starts together Saturday morning at 7 AM, and the whole event, across every format, closes out by 2 PM Sunday. If you are chasing the 100 mile buckle, know your 80 mile split time going in, since that is the number that decides whether you get the extra 7 hours or not.

Free camping and a loop you never lose sight of

Boundiful offers free on-course camping from Friday at 4 PM through Sunday at 4 PM, which makes crewing yourself dramatically easier than at most ultras: your tent, cooler, and gear can sit right off the loop the entire race. Because you pass the start/finish area every single mile, you never have to guess when you will see your own setup again.

That access cuts both ways for pacing. It is easy to linger too long at your own camp chair on lap 40 when the loop has lost its novelty. Treat your stops like a fast pit crew, not a rest stop, especially in the first half, and save the longer sits for when you actually need them late in the race.

Pacing strategy for a flat, repetitive loop

A flat course tempts you to bank time early because it feels easy. On a race that can run 24, 31, or more hours, that borrowed pace almost always gets paid back with interest late.

Run the early loops slower than they feel

With almost no climbing and great footing, your first few laps will feel deceptively easy, and that is exactly when most Boundiful runners overcook their pace. Pick an effort you could repeat for your entire event, not just the first few hours, and hold it even when the flat ground makes going faster feel free. If you are chasing the 100 mile buckle, work backward from your 80 mile split target so you know exactly what pace keeps that 7 hour extension in reach.

Build a real finish window from your early laps

Because the course is loop-based, you get honest pacing data almost immediately. A finish-time projection built off your actual early lap splits, extrapolated across your full event, is far more useful than any generic ultra pace chart, especially with the 100 mile buckle math riding on your 24 hour split. Check that projection early and often, while you still have room to adjust effort instead of just hoping the back half goes better.

Fueling strategy for a long, flat day (and night)

Aid on every single mile is a real advantage. Use it to fuel on a schedule instead of by feel, because a flat, unchanging loop makes it easy to lose track of when you last ate.

Carbs: steady, on the clock

Aim for roughly 60 to 90 grams of carbohydrate per hour, and use the every-lap access to your own crew spot or cooler to keep intake consistent rather than gambling on a big late push. Set an hourly target before the race starts and take it on schedule, since the flat, repetitive loop makes it surprisingly easy to drift for an hour or more without realizing you have not eaten.

Sodium and fluid: plan for however long you are out there

Keep sodium in the 300 to 700 mg per liter range, leaning higher if the day runs warm or you are a heavy sweater. Because a 100 mile buckle attempt can stretch well past 24 hours, plan your electrolyte and caffeine strategy for a genuine overnight effort, not just a single hot afternoon, and use your on-course camp to reset your kit between loops instead of carrying everything for the whole race.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a multi-hour or multi-day timed effort with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.

⏵ Train for it with Summit Line

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Boundiful Endurance Runs FAQ

How does the Boundiful Endurance Runs format work?

Boundiful runs on a flat, 100% hardpacked dirt, 1 mile loop on a Southern California fruit and nut farm, and you pick your format going in. The timed events (3, 6, 12, and 24 hour) end when the clock runs out and you get credit for the distance you covered. The 100 mile option runs on its own buckle math: everyone gets a 24 hour window, but if you reach 80 miles inside that first 24 hours, you earn 7 more hours to finish the full 100, for a 31 hour overall cap. There is also a relay division for teams of 2 or more. Everything starts together Saturday at 7 AM and the event wraps up by 2 PM Sunday.

How hard is Boundiful Endurance Runs?

It is not hard the way a mountain ultra is hard. The loop is flat, wide, and 100% hardpacked dirt with no gravel, asphalt, or pavement, and each lap only carries about 50 feet of gain, so the terrain will not break your legs. What makes Boundiful hard is exactly what makes it appealing to first-timers: the repetition and the clock. Running the same mile again and again for 24, 31, or more hours is a mental and pacing test more than a technical one, which is why the race markets itself directly at runners who have struggled with cutoffs elsewhere or want a fast, honest PR attempt.

How should I fuel for Boundiful Endurance Runs?

Plan for a long, flat, all-day-or-longer effort with aid never far away on a 1 mile loop. Aim for roughly 60 to 90 grams of carbohydrate per hour, and keep sodium in the 300 to 700 mg per liter range, adjusting up if you run hot or the day turns warm. Because you pass the start/finish area, and likely your own crew spot or cooler, every single mile, you can restock constantly instead of carrying much between stops. Set an hourly target ahead of time and take it on the clock rather than by feel, since a flat repetitive course makes it easy to lose track of when you last ate. Build your numbers with the free ultra fueling calculator before race day.

What are the cutoffs at Boundiful Endurance Runs?

The 100 mile race runs under a 31 hour overall cap: you get an initial 24 hours, and reaching 80 miles inside that window earns you 7 more hours to complete the full 100. The timed events (3, 6, 12, 24 hour) have no distance cutoff to chase, since you simply run until your clock expires and get credit for the distance covered. The whole event, across every format, wraps up at 2 PM Sunday. Because the course is flat, cupless-free, and aid is on every lap, these are some of the more generous cutoffs you will find at an event built around a 100 mile buckle.

What is the course like at Boundiful Endurance Runs?

The course is a single 1 mile loop around Washburn Ranch, a working Southern California fruit and nut farm, run on a wide, 100% hardpacked dirt surface. There is no gravel, asphalt, or sidewalk anywhere on the course, the turns are smooth, and there is ample room to pass, so congestion is not something you have to think about even with runners moving at very different paces. Each loop carries about 50 feet of gain, essentially flat by ultra standards, and past participants note the shade from the fruit trees and the smell of blossoms as part of the charm of the venue.

Is Boundiful Endurance Runs a good first ultra or first 100 miler?

Yes, and the race says as much about itself: it is built for runners who have had trouble with cutoffs elsewhere or who want a fast, flat course to chase a PR or their first buckle. The flat hardpacked loop removes the technical trail risk of a mountain 100, the every-lap aid access removes most of the logistics stress, and the 31 hour buckle window (with the built-in 7 hour extension off an 80 mile first day) gives a well-prepared first-timer real room to finish. The trade-off is the same one every looped race asks: you have to be ready for the mental grind of running the same mile over and over, sometimes through a full night or two, rather than the changing scenery of a point-to-point course.

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This guide is independent and for planning only. The format, date, cutoffs, and camping details come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.