Approaching Zion-Mount Carmel Tunnel, Zion National Park, Utah · Ken Lund · CC BY-SA 2.0 · cropped
The Utah Department of Transportation will close the Zion-Mount Carmel Tunnel overnight starting Monday, September 21, 2026, while crews install fiber optic cable along State Route 9. UDOT’s Zion Area road board, updated at 10:48 a.m. on September 19, lists full closures from 9 p.m. to 6 a.m. on September 21 to 25 and again on September 28 to 30, covering the highway between the east entrance of the tunnel and Canyon Junction.
Anyone linking Springdale to Zion’s East Entrance, Bryce Canyon, or Kanab after dark has to wait until 6 a.m. or take a longer surface route. Build that window into a Zion National Park night arrival, a hotel change, or a sunrise start from the east side before the first closure hits.
- Hours: 9 p.m. to 6 a.m. nightly on the listed dates.
- First block: September 21 to 25, 2026.
- Second block: September 28 to 30, 2026.
- Closed segment: East tunnel entrance to Canyon Junction on SR-9.
- Trail note: Canyon Overlook parking shifts to the vault toilet lot, then a quarter-mile walk.
Night Closures Sit on the Park’s Cross-Park Highway
The Zion-Mount Carmel Highway is the paved link between Zion Canyon and the park’s East Entrance. The 1.1-mile tunnel is the pinch point. When UDOT closes the segment from the east portal to Canyon Junction, cars cannot roll through the tunnel in either direction until 6 a.m.
UDOT’s September 19 status note places the work at SR-9 mileposts 38 to 39 and flags both daytime and nighttime construction. Daytime travel still moves. Overnight travel does not. The agency says fiber line installation is continuing along SR-9 as part of its Zion Canyon Technology project with the National Park Service.
Gephardt Daily reported the same dates on September 19 after Zion National Park advised visitors to prepare for the nighttime shutdowns. The park’s notice, as carried by the Salt Lake outlet, says dates can still move with UDOT’s schedule and points drivers to the department’s site for the live list.
Springdale, East Zion, and Bryce Drivers Split on Timing
Stay west of Canyon Junction after 9 p.m. and the closure is mostly a non-event. Lodging in Springdale, the visitor center, and the Zion Canyon Scenic Drive sit on the west side. You can still reach those places from I-15 and Hurricane on SR-9, subject to separate Springdale work zones.
The problem is a night crossing. A guest who leaves a Kanab hotel at 5 a.m. for a Zion Canyon shuttle day, a photographer driving east for a Checkerboard Mesa sunrise, or anyone routing between Bryce Canyon and Zion during the listed hours cannot use the tunnel. That is the trip that has to start after 6 a.m. or take the long way around.
Large recreational vehicles already lost this highway on June 7, 2026, under Zion’s size rules, so the new night closures mainly hit passenger cars and smaller rentals that still fit the tunnel. Do not treat the fiber shutdown as a new RV ban. Treat it as a clock on the remaining legal traffic.
Detours Add Time Once the Tunnel Goes Dark
Zion’s visitor notice, as reported by Gephardt Daily, lists Utah 20, Utah 14, and the US 89 to Arizona 389 to Utah 59 chain as the posted alternates. The park said those options can add 10 to 45 minutes, depending on origin and destination. That range is the planning number until UDOT posts a different one.
Utah 14 over the Markagunt Plateau is a mountain road. Utah 20 is the short I-15 connector north of the park. The southern loop through Fredonia and Colorado City uses Arizona 389. None of those roads replace a 15-minute tunnel crossing with an identical drive. Budget fuel, weather, and night wildlife on the long way, then re-enter Zion at Springdale or the East Entrance after 6 a.m.
If the only goal is a bed in Springdale, skip the east side after 9 p.m. Come in from Hurricane. If the only goal is an East Entrance trailhead, sleep in Mount Carmel or Kanab and wait for the 6 a.m. reopen rather than circling in the dark.
Canyon Overlook Stays Open With a Longer Walk
Canyon Overlook Trail sits just east of the tunnel. During the closure hours, UDOT and the park say visitors should park at the nearby vault toilet and walk about a quarter mile to the trailhead. That is a night and early-morning change, not a trail shutdown.
Carry a light. The extra walk is short, but it is on a construction corridor with no through traffic. Do not stop in the tunnel approaches or try to turn around at either portal. Pedestrians and bicycles are already barred from riding through the tunnel even when the road is open.
Sunrise hikers who want Canyon Overlook on a listed morning should be in the vault-toilet lot before 6 a.m. or wait until the road reopens and the usual trailhead parking comes back. Confirm the lot is still the backup that morning. UDOT can shift the work window.
Springdale Night Work Is a Delay, Not a Tunnel Closure
The same September 19 board lists separate fiber work in the Town of Springdale at SR-9 mileposts 29 to 31. That zone runs Monday through Saturday with night hours of 8 p.m. to 4 a.m. UDOT calls the effect minor traffic delays and pedestrian or cyclist detours, not a full road closure.
Do not merge the two alerts. A Springdale hotel guest walking to dinner is in the town work zone. A driver trying to thread the historic tunnel after 9 p.m. is in the park closure. Hurricane and Mount Carmel segments of SR-9 also have daytime shoulder work. Watch for crews. Those stretches stay open.
For a same-season road clock inside the canyon, Deep Arrival already tracked when the Zion Canyon Scenic Drive returns to private cars on November 29. That shuttle calendar is a different gate from these September nights on the tunnel.
| If you… | What to do |
|---|---|
| Need the tunnel after 9 p.m. on a listed night | Wait until 6 a.m. or use Utah 20, Utah 14, or US 89 to Arizona 389 to Utah 59. |
| Sleep in Springdale and stay west of Canyon Junction | Keep the I-15 and Hurricane approach. The tunnel is not required. |
| Want Canyon Overlook before 6 a.m. | Park at the vault toilet lot and walk about a quarter mile to the trailhead. |
| Drive an RV or other oversize vehicle | You already cannot use this highway under the June 7, 2026, size rule. Use the posted large-vehicle alternate. |
September 21 at 9 p.m. is the first full tunnel closure. Finish any east-west crossing before then or start the detour in daylight.
September 25 at 6 a.m. ends the first five-night block. The road is then listed open through the September 26 to 27 weekend nights unless UDOT adds shifts.
September 28 at 9 p.m. starts the second block through 6 a.m. on September 30. Recheck the UDOT Zion Area board the afternoon you drive. The park said the dates can move.
When does the Zion-Mount Carmel Tunnel close in September 2026?
UDOT lists 9 p.m. to 6 a.m. on September 21 to 25 and September 28 to 30. The closed stretch runs from the east tunnel entrance to Canyon Junction.
Is Zion National Park closed at night during the fiber work?
No. The park remains open 24 hours. Only this SR-9 segment, including the tunnel, is closed to vehicles during the listed overnight hours.
How much extra time do the alternate routes add?
Zion’s visitor notice, as reported on September 19, said the posted alternates can add 10 to 45 minutes depending on your start point and destination.
Can I still hike Canyon Overlook while the tunnel is closed?
Yes. Park at the vault toilet near the east side and walk about a quarter mile to the trailhead during closure hours.
Does daytime traffic still use the tunnel?
Yes. UDOT is running daytime work on the same mileposts, but the overnight period is the full closure. Expect crews and equipment after sunrise.
Where should I check if the nights change?
Use UDOT’s Zion Area road-information page the day you drive. Zion told visitors the dates remain subject to the contractor’s schedule.
