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The best-supported alternate route from Denver to Aspen during a long Glenwood Canyon safety closure is the northern detour recommended by the Colorado Department of Transportation (CDOT): take I-70 west to Silverthorne, CO 9 north to Kremmling, US 40 west toward Craig, and CO 13 south to Rifle, then rejoin I-70 and continue to Glenwood Springs. From there, take CO 82 south to Aspen if it is open. CDOT estimates the detour adds about two and a half hours compared with traveling through Glenwood Canyon; that is extra time, not a guaranteed total-trip estimate. Check CDOT’s Glenwood Canyon guidance and live conditions before departure. As of November 3, 2026, Independence Pass is closed for winter.
At a glance
| Name | Best for | Key spec | Checked |
|---|---|---|---|
| Silverthorne–Kremmling–Craig–Rifle northern detour | Driving around a Glenwood Canyon safety closure expected to last more than one hour | CDOT-recommended; about 2.5 hours added versus driving through the canyon | November 2026 |
| US 285 and US 50 | Some I-70 closures when traveling between Denver and Grand Junction | Not established by CDOT as a general Aspen detour | November 2026 |
| Local county and forest-service roads south of I-70 | Not recommended as an improvised canyon detour | CDOT warns of construction closures, roads unsuitable for heavy traffic, and limited or no cell coverage on some roads | November 2026 |
| Independence Pass (CO 82) | Not an option for crossing the pass while its winter closure is in effect | Closed for winter as of November 3, 2026; reopening is weather-dependent | November 2026 |
Which route should I take from Denver to Aspen during a Glenwood Canyon closure?
For a Glenwood Canyon safety closure CDOT expects to last longer than an hour, use its northern detour. It takes you around the canyon on state highways and reconnects you with I-70 at Rifle. CDOT does not publish a separate, scheduled-closure route specifically for Aspen-bound drivers, so treat this as the recommended way around the canyon—not a promise that every road on the route, or the Aspen approach, is open at your departure time.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →- From Denver, take westbound I-70 to Silverthorne. Stay on the interstate until the signed connection for CO 9. This first leg is the approach to the detour, not a shortcut south of the closure.
- Take CO 9 north to Kremmling. Remain on the state highway and check current conditions as you leave the I-70 corridor.
- Take US 40 west toward Craig. The route uses US 40 to move across the northern part of the state rather than trying to pass through Glenwood Canyon.
- Take CO 13 south to Rifle and rejoin I-70. Rifle is the western connection back to I-70 identified in CDOT’s guidance.
- Continue on I-70 to Glenwood Springs. If conditions permit, take CO 82 south from Glenwood Springs to Aspen.
For planning purposes, think of the drive as two separate decisions: first, getting around the canyon and back to I-70; second, confirming that the final I-70-to-Glenwood-Springs-to-Aspen leg is open. A clear detour does not make a separate closure on I-70 or CO 82 disappear.
How to enter the route in a navigation app
Navigation software may try to recalculate around congestion or a newly reported incident. Entering intermediate points such as Silverthorne, Kremmling, and Rifle can help you recognize whether the app is actually following the official sequence. Do not accept an automatic turn onto a county, forest-service, or pass road simply because it appears shorter. Posted signs, law-enforcement directions, and current CDOT instructions take priority over a calculated route.
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How much extra time does the detour add?
CDOT says, “The alternate route will add approximately two and a half hours of travel time compared to taking I-70 through Glenwood Canyon.” That is the agency’s comparison for the northern alternate. It is not a current total Denver-to-Aspen travel time, and it is not a guarantee that the same penalty will apply to every incident.
The actual delay can be different when traffic is already building on I-70, when snow or other weather slows any segment, or when a second restriction affects the route to Aspen. The estimate also does not tell you how long it will take to travel from Glenwood Springs to Aspen after you rejoin I-70. Use the figure to decide whether the trip remains practical, then use live information for the conditions that determine your departure time.
If the canyon is expected to reopen soon, a two-and-a-half-hour diversion may be unnecessary. CDOT’s trigger for this recommendation is a safety closure expected to last more than one hour. For a shorter hold, follow the current incident instructions rather than leaving the interstate and committing to the full northern loop.
When does the northern detour apply?
CDOT says it recommends this detour when a safety closure is expected to last more than one hour. That is guidance for a particular kind of closure, not a rule that every restriction, crash, or short-lived hold calls for the same response. A crash investigation, falling rock, fire, snow event, or other incident can change both the expected duration and the roads available around it.
Check the Glenwood Canyon page and Independence Pass travel information, and use COtrip.org or the COtrip Planner app for current conditions. Recheck close to departure and again if the trip is long enough for conditions to change. A published alternate describes the intended network; it cannot establish what is open at the moment you reach a junction.
What is the Aspen approach after Rifle?
Once you reach Rifle, the recommended route rejoins I-70. Continue east or west as directed by the closure and then travel to Glenwood Springs. For an Aspen-bound trip, the normal final connection is CO 82 south from Glenwood Springs, provided that segment is open and current restrictions allow travel.
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This distinction matters because avoiding Glenwood Canyon is only one part of the journey. CO 82 can have its own weather, crash, construction, or traffic restrictions. Check that leg separately instead of assuming that a route shown as open to Glenwood Springs continues all the way to Aspen. If CO 82 is restricted, follow current official instructions; do not substitute an unverified county or forest road.
Is Independence Pass an alternate route to Aspen?
Not while its seasonal winter closure is in effect. CDOT announced the 2026–2027 winter closure on November 3, 2026, so as of that date the pass is not an eastern crossing into Aspen. For the current closure and seasonal information, consult CDOT’s winter-closure announcement and Independence Pass travel page.
The pass usually closes around early November and reopens around the Thursday before Memorial Day, weather permitting. That typical schedule is not a forecast or confirmation of the opening date in a particular year. Its narrow, winding roadway has steep inclines, and vehicles—or vehicle-and-trailer combinations—longer than 35 feet are prohibited. Even when the pass is seasonally open, check its live status and restrictions before considering it.
Independence Pass is therefore not a way to bypass the northern detour during the current winter season. The Aspen leg for this closure remains I-70 to Glenwood Springs and then CO 82 south, if open. A navigation app may display the pass based on a normal-season map; a map display is not proof that the gate is open.
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Do not treat US 285 and US 50 as an equivalent, generally approved Aspen detour. CDOT has described those highways as a route between Denver and Grand Junction during some I-70 closures. That destination-specific guidance does not establish the route as a substitute for reaching Aspen, and it does not override current restrictions on the roads needed for your particular trip.
Compare the options by destination, not just by the fact that they avoid I-70. The northern route is the one CDOT identifies for a long Glenwood Canyon safety closure and reconnects with I-70 at Rifle, which places you back on the corridor used to reach Glenwood Springs. US 285 and US 50 may be relevant to a Grand Junction trip under separate instructions, but that is a different travel objective. Unless current CDOT guidance specifically directs Aspen traffic that way, do not assume it is faster, open, or suitable.
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Why not use a local road south of I-70?
CDOT strongly discourages using highways south of I-70 as an alternative during a Glenwood Canyon closure because of extensive construction closures. It also specifically warns drivers not to improvise via Cottonwood Pass Road, Hagerman Pass, Eagle/Thomasville Road, or other county and forest-service roads in Eagle, Garfield, and Pitkin counties.
The warning is about more than inconvenience. CDOT says these roads are not designed for heavy traffic or commercial oversize vehicles. Some are four-wheel-drive roads without cell coverage. They may lack the capacity, surface, width, winter maintenance, or communications support needed when a major interstate closure sends large numbers of vehicles looking for a way through. A road that is passable for a local resident in suitable conditions is not automatically an appropriate through route for passenger traffic, buses, trailers, or commercial vehicles.
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Route comparison: what each option actually means
| Option | Official status | Destination fit | Main limitation |
|---|---|---|---|
| CO 9–US 40–CO 13 | CDOT’s northern alternate for a safety closure expected to exceed one hour | Connects Denver-side I-70 with Rifle, then the Glenwood Springs and Aspen approach | Adds approximately 2.5 hours versus Glenwood Canyon, subject to live conditions |
| US 285–US 50 | Described by CDOT for some Denver–Grand Junction I-70 closures | Not established as a general Denver-to-Aspen substitute | Destination-specific guidance cannot be transferred automatically |
| Independence Pass | Seasonal pass with a winter closure as of November 3, 2026 | Not available for the current winter crossing | Weather-dependent opening; narrow, winding road and 35-foot vehicle limit when open |
| County and forest-service roads | Discouraged for an improvised canyon detour | Not a dependable through route for diverted interstate traffic | Construction closures, limited capacity, and possible lack of cell coverage |
What should I check before leaving?
Make the decision using the live closure and conditions, not only a route description or an estimated drive time. Use this checklist shortly before departure:
- Confirm the closure and its expected duration. CDOT’s northern-detour recommendation applies when a Glenwood Canyon safety closure is expected to exceed one hour; incident details may change.
- Check each leg, including the Aspen approach. Verify conditions on CO 9, US 40, CO 13, the I-70 connection at Rifle, and the I-70 and CO 82 segments between Glenwood Springs and Aspen.
- Check Independence Pass status separately. It is closed for winter as of November 3, 2026, and its spring reopening depends on weather and official status.
- Allow for the detour penalty. CDOT’s approximately 2.5-hour figure is extra time compared with going through Glenwood Canyon, not the total Denver-to-Aspen trip time.
- Look for restrictions affecting your vehicle. The pass has a 35-foot limit when open, and local roads may not be designed for heavy or oversize traffic.
- Save current information before entering weak-service areas. CDOT notes that some county and forest-service roads have no cell coverage; that is another reason not to rely on them as a backup.
- Follow official directions on the road. Do not divert onto named county or forest-service roads to avoid traffic unless official instructions direct you there.
For general mountain-driving preparation, CDOT recommends carrying an emergency kit and having adequate tires. Those preparations do not replace checking closures or make a restricted route passable.
What if conditions change after I start?
Keep checking official updates during a long detour. A route that was open when you left Denver may be affected later by a crash, weather, or a new closure. If signs or traffic control direct you differently from the route you entered into your app, follow the on-road direction. Do not continue toward a closure because the app has not refreshed.
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If the canyon reopens while you are still near Denver, compare the current official direction with your position and the conditions on the northern loop. The two-and-a-half-hour figure is a comparison, not a reason to complete a diversion that is no longer needed. Conversely, if a restriction expands, do not assume that a road south of I-70 is an acceptable escape; check COtrip for the updated, destination-specific instruction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What if I am driving eastbound?
The same detour is used in reverse for eastbound I-70 traffic: from Rifle, take CO 13 north to US 40, US 40 east to Kremmling, CO 9 south to Silverthorne, and then I-70 east. If your trip is specifically to Aspen, the Denver-to-Aspen sequence above is the relevant direction; always verify the current instructions for your direction and destination.
The reverse sequence does not change the basic limitations. It is still intended for a safety closure expected to last more than one hour, still depends on live conditions on every state-highway segment, and still does not authorize local roads or a closed pass. Confirm the direction of travel in COtrip before choosing an on-ramp or turning around at the closure.
Practical planning questions
Should I plan a fixed arrival time around the 2.5-hour figure?
No. Treat it as an approximate added-time comparison. It does not include a guaranteed total trip, a specific traffic forecast, or the time from Glenwood Springs to Aspen.
Can a trailer use Independence Pass when the pass is open?
Only if the vehicle-and-trailer combination complies with the pass restrictions. CDOT prohibits vehicles or combinations longer than 35 feet. Check the current pass information before travel.
Does the northern detour avoid every possible closure?
No. It avoids the Glenwood Canyon segment by using CO 9, US 40, and CO 13, but each leg can have its own incident or weather restriction. The Aspen approach also must be checked separately.
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Is a four-wheel-drive local road safer in bad weather?
Not necessarily. CDOT warns that some local and forest-service roads are four-wheel-drive routes without cell coverage and are not designed for diverted heavy traffic. Four-wheel drive does not turn an unsuitable or closed road into an approved detour.
Frequently Asked Questions
Does the two-and-a-half-hour estimate include the drive from Glenwood Springs to Aspen?
No. CDOT’s figure compares its northern alternate with driving through Glenwood Canyon; it is not a total Denver-to-Aspen estimate. It does not guarantee how long the remaining drive or any traffic delay will take.
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When should I use the northern detour instead of waiting?
CDOT recommends it when a Glenwood Canyon safety closure is expected to last more than one hour. For a shorter hold, check the current incident instructions and expected reopening rather than automatically committing to the full loop.
What are the exact detour highways from Denver?
Take westbound I-70 to Silverthorne, CO 9 north to Kremmling, US 40 west toward Craig, and CO 13 south to Rifle. Rejoin I-70, continue to Glenwood Springs, and take CO 82 south to Aspen if that segment is open.
Is Independence Pass open as of November 2026?
No. CDOT announced the 2026–2027 winter closure on November 3, 2026. The pass usually reopens around the Thursday before Memorial Day, weather permitting, but only current official status confirms an opening.
Can I take Independence Pass with a long vehicle or trailer when it is open?
CDOT prohibits vehicles, and vehicle-and-trailer combinations, longer than 35 feet on Independence Pass. Check CDOT’s current pass information for status and restrictions before travel.
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For a Glenwood Canyon safety closure expected to exceed one hour, CDOT’s supported Denver-to-Aspen detour is I-70 to Silverthorne, CO 9 to Kremmling, US 40 toward Craig, CO 13 to Rifle, then I-70 to Glenwood Springs and CO 82 to Aspen if open. Expect approximately 2.5 extra hours versus the canyon, keep Independence Pass out of the plan while its winter closure is active, and verify every segment on COtrip immediately before departure.
