Overview
Mount Nebo is 11,928 feet and the southernmost and highest summit in the Wasatch Range — and the Nebo Loop Scenic Byway circumnavigates its base in 38 miles of one-way road between Payson and Nephi. Ridden as an out-and-back from Payson, it's a 73-mile day with nearly 6,000 feet of climbing that covers terrain most Utah cyclists have never explored. This is not a canyon climb. It's a full Wasatch circumnavigation, and the scale of the landscape — massive summit to the east, Utah Valley receding behind you, Juab County's open desert rolling south — is part of what makes it worth seven to ten hours.
The north approach from Payson is the longer, more gradual side: the road climbs Payson Canyon in a narrow drainage before opening onto alpine terrain, reaching a high point near 9,400 feet, and descending in long, sweeping curves toward the Mona/Nephi area. The southern side is notably steeper — the descent from the north becomes a 5–8% grind on the return if you choose to do it southbound first. Most riders start from Payson and run counterclockwise, climbing the gradual north side and returning via the south; know the full elevation profile before committing.
This is a remote, full-day effort in a region with limited services. The road is typically closed November through May due to snow. In a big winter, snow can linger at the summit into June.
The Route
The route starts in Payson, climbs east through Payson Canyon, follows the Nebo Loop Scenic Byway south past Mount Nebo, descends toward the Nephi area, and returns the same way for the full out-and-back.
Miles 0–9: Payson Canyon Climb From Payson at ~4,700 feet, the route heads east on 800 South before entering Payson Canyon on the Nebo Loop Road (FR 015). The canyon is narrow and shaded, following a mountain stream upward with the grade starting moderate before pushing steeper in the middle section. Around mile 9, a sustained two-mile steep pitch — the kind that arrives when your legs have already done real work — precedes a brief false crest. Don't be fooled.
Miles 9–18: Upper Alpine and Summit Plateau Above the steeper section, the road transitions into open alpine terrain at 8,000–9,000 feet with long views east toward the Uinta Mountains and west across Utah Valley. This is where Mount Nebo's bulk becomes fully apparent — the summit ridge and north peak are enormous from this angle, all limestone and dark conifers at treeline. The summit high point on the road sits near 9,400 feet in open terrain that holds snow late into the season. Plan for significant temperature drop and wind at the high point regardless of what the forecast says in the valley.
Miles 18–30: South Side Descent Toward Nephi The descent off the south side of the loop drops through red rock formations, gray sandstone cliffs, and increasingly open desert terrain toward the Juab Valley. Devil's Kitchen Geologic Interest Site at roughly mile 28 from Payson — red hoodoos in a small canyon with a paved trail and overlook — is worth a brief stop if the legs and timeline allow. The descent is long and satisfying, the road quality is good, and the scenery shifts from Wasatch mountain to high-plateau desert in a way that feels genuinely different from the canyon rides that dominate most Wasatch riding.
Turnaround: Nephi Area Most riders use the junction with SR-132 near Nephi as the turnaround point, adding any valley road miles as desired. Nephi is a small town with gas stations and basic services — this is where you refuel for the return climb.
Miles 30–73: Return to Payson The return retraces the route north, meaning the gradual north-side climb becomes a gradual descent, and the brief steep section near Payson Canyon that hurt on the way out now delivers some momentum going home. The south-side climb on the return is the honest reckoning — the grade that dropped you into the Juab Valley now has to be climbed back out. This is where the day's accumulated fatigue concentrates.
What to Bring
- 3 full bottles and a resupply plan — Nephi at the turnaround is the only opportunity to refill; carry 3 liters minimum leaving Payson and drink deliberately
- Substantial food — 7–10 hours of riding burns well over 3,000 calories; treat this like an endurance event and pack accordingly
- Full warm layer — the summit plateau at 9,400 feet in afternoon wind is a genuine cold-weather environment regardless of what the valley temperature reads
- Sunscreen — the south descent is exposed for miles; the combination of elevation and open terrain means UV exposure is significant
- Charged phone and downloaded map — the Nebo Loop road is well-marked, but cell service is poor above the canyon; have a downloaded GPS track
Local Tips
- Best window: Late June through September after road opening, with early-to-mid September offering the most reliable conditions and least summer heat on the exposed south descent
- Start time: No later than 6:30am — this is a long day and an early start protects you from afternoon thunderstorm exposure near the summit and gives buffer for the unexpected
- Payson Canyon services: Gas and food in Payson before you leave; nothing available until Nephi 36 miles later
- Devil's Kitchen: The short walk to the hoodoos is worth five minutes if you're on schedule — it's a legitimate geological oddity and a welcome change of perspective mid-day
- Post-ride: Payson has basic food options near I-15; if you want a proper meal, Provo is 20 miles north with far more choices