Most commuters have a gut feeling about which day is worst. The research mostly backs that instinct — but it also shows the answer isn't the same everywhere, and that matters more than the national average.
What the national research says
Two of the most-cited sources in US traffic research broadly agree on the shape of the week, with one important nuance.
The Texas A&M Transportation Institute's 2025 Urban Mobility Report, which analysed delays across hundreds of US cities, found Monday is the least congested weekday — researchers attribute this to workers with flexible schedules choosing to stay home at the start of the week. The same report found Tuesday, Wednesday and Thursday have all climbed, with Thursday now matching Friday as the heaviest commuting day, as weekend-related trips mix into the normal commute.
Separately, analysis by traffic data firm Inrix found Friday afternoon is the worst time to drive in roughly three-quarters of US metro areas — a combination of full commute volume, people leaving early for the weekend, and errands before the weekend starts.
So which is it — Thursday or Friday?
Both, depending where you are. That's the honest answer, and it's the useful one. Research on Los Angeles freeways, for example, has pointed to Thursday as the heaviest day, while in several Texas metros the single most congested hour of the week falls on Friday afternoon. National averages smooth over exactly the differences that affect your drive.
Three things shift the pattern locally:
- Remote-work mix. Cities where more people work from home on Mondays and Fridays see midweek days get relatively worse.
- Weekend outflow. Metros near holiday or weekend destinations get hit harder on Friday afternoons as through-traffic joins the commute.
- Employment mix. Areas dominated by early-start industries peak at different hours than office-heavy districts.
The worst traffic days of the year
Day of week is one pattern; day of year is another, and the seasonal spikes dwarf any normal Tuesday. Holiday travel data from AAA and INRIX gives a consistent picture:
- Thanksgiving is the single busiest travel holiday in the US. The worst driving windows are the Tuesday and Wednesday afternoons before Thanksgiving — roughly 12–9pm on Tuesday and 11am–8pm on Wednesday. Holiday congestion can stretch travel times dramatically in major metros.
- Thanksgiving Day itself is one of the best days to drive. Once everyone has arrived, the roads clear — forecasters consistently expect minimal traffic impact on the holiday itself.
- The return trip is its own problem. The Sunday after Thanksgiving is heavy for most of the day as everyone drives home at once.
- Christmas and New Year spread the pain out. Rather than one peak day, the days before and after the holidays run congested for much of the day, with the return stretch after Christmas among the worst. Christmas Eve, Christmas Day and New Year's Eve themselves tend to be quiet on the roads.
The consistent advice across all of it: leave in the morning. On nearly every heavy holiday travel day, the early morning window before the afternoon build-up is the clearest.
Your route has its own worst day
Even within one city, two routes can behave differently — a corridor feeding an office district doesn't peak like one feeding a factory or a school zone. So the practical question isn't "what's the worst day in America," it's "what's the worst day on my route."
That's what BoardSpy's monthly insights answer. For your saved route it reports the best and worst day of the week, the average delay in minutes for each weekday, and a recommended leave-by time and a time to avoid for both the morning and evening commute — so you can see, for instance, that your Wednesday runs a couple of minutes late while your Friday runs closer to five, and plan around it. See the general guide to the best time to leave for work, or your city's version for Chicago, LA, or Houston.
How to use this
If you have any flexibility at all, the pattern is worth exploiting. Schedule the trips you can control — appointments, errands, an in-office day if you're hybrid — onto your route's lighter days, and treat its worst day as the one where you leave earlier or later than usual rather than straight into the peak.
Frequently asked questions
What day of the week has the worst traffic?
Nationally, Thursday and Friday are the heaviest, with Friday afternoon the worst period in roughly three-quarters of US metro areas. Some cities peak on Thursday instead, so your local pattern may differ.
What is the best day to drive to work?
Monday is typically the lightest weekday in most US cities, according to the Texas A&M Transportation Institute's 2025 report, largely because workers with flexible schedules often stay home at the start of the week.
Why is Friday afternoon so bad for traffic?
Friday afternoon combines a full commute with people leaving early for the weekend and running errands before it starts. In metros near weekend destinations, through-traffic adds to it.
How do I find the worst traffic day for my own route?
Track your specific route rather than relying on city averages. BoardSpy's monthly insights report the best and worst day for your saved route, plus the average delay for each weekday.
What are the worst traffic days of the year?
Thanksgiving is the busiest US travel holiday, with the Tuesday and Wednesday afternoons before it the most congested driving windows, and the Sunday after heavy most of the day. The days around Christmas and New Year are also congested for much of the day.
What is the best time to drive on a holiday weekend?
Morning. On nearly every heavy holiday travel day, the window before the afternoon build-up is clearest — and the holiday itself, such as Thanksgiving Day or Christmas Day, is usually one of the quietest days to be on the road.
References
Figures and patterns in this article draw on published traffic research and holiday travel forecasts from the sources below.
- 2025 Urban Mobility Report — Texas A&M Transportation Institute (TTI). Congestion analysis across hundreds of U.S. urban areas, including weekday delay patterns.
- Traffic hits record high as commuters rewrite the rush hour — TTI press summary of the 2025 Urban Mobility Report findings.
- INRIX Global Traffic Scorecard — City and regional congestion rankings and commuting trends from observed probe data.
- America Back on the Road to Gridlock — INRIX National Traffic Scorecard analysis of worst weekday/commute windows (including Friday afternoon peaks).
- AAA Thanksgiving Travel Forecast 2025 — AAA holiday travel volume projections and timing guidance.
- Nearly 82 Million Americans Projected to Travel over Thanksgiving — Joint AAA/INRIX holiday congestion windows (pre-Thanksgiving Tuesday–Wednesday afternoons; Sunday return).