San Mateo · Last 48 Hours

San Mateo Accidents Today

31 accidents near San Mateo in the last 24 hours · 61 in 48 hours · updated July 29, 2026 12:21 PM PDT

31

Last 24h

61

Last 48h

5

High Severity

133

This Week

33

Construction

28

Accident

7-Day Trend

133 crashes

↑ More than last week

133 crashes in the last 7 days, up 14% vs the previous week.

Last 6 hours

4 incidents

2h ago 10:00 AM

CHP : Traffic Collision with Injuries on CA-35 Northbound at Alpine Rd (Unincorporated). Lane affected. Expect delays.

CHP : Residual delays on US-101 Southbound north of E Hillsdale Blvd (San Mateo). Right shoulder affected. Expect delays.

Caltrans : Roadwork on CA-1 Northbound and Southbound at Swanton Rd (Unincorporated). Lane closed. One way traffic control in effect. From 7:00 AM Wednesday, July 29, 2026 to 5:00 PM Wednesday, July 29, 2026.

CHP : Traffic Collision on US-101 Northbound south of Kehoe Ave (San Mateo). Left lane blocked. Expect delays.

6–12 hours ago

11 incidents

Caltrans : Roadwork on CA-1 Northbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

Caltrans : Roadwork on US-101 Southbound between Broadway (Burlingame) and E Poplar Ave (San Mateo). Various lanes closed until 5 AM. From 11:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

Caltrans : Roadwork on US-101 Northbound between CA-92 E (San Mateo) and E 3RD Ave (San Mateo). Various lanes closed until 5 AM. From 10:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

Caltrans : Roadwork on US-101 Southbound between Woodside Rd (Redwood City) and Marsh Rd (Menlo Park). Various lanes closed until 5 AM. From 9:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

Caltrans : Roadwork on CA-82 Northbound between I-380 W (San Bruno) and S Spruce Ave (South San Francisco). Lanes closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

Caltrans : Roadwork on US-101 Southbound between CA-92 E (San Mateo) and E Hillsdale Blvd (San Mateo). Various lanes closed until 5 AM. From 8:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

11h ago 12:45 AM

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

11h ago 12:45 AM

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

11h ago 12:45 AM

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

11h ago 12:45 AM

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

11h ago 12:45 AM

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

12–24 hours ago

16 incidents

14h ago 10:00 PM

Caltrans : Roadwork on CA-82 Northbound at CA-84 (Redwood City). Lane closed until 5 AM. From 9:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

14h ago 10:00 PM

Caltrans : Roadwork on US-101 Northbound between Anza Blvd (Burlingame) and Broadway (Burlingame). Lanes closed until 4 AM. From 9:00 PM Tuesday, July 28, 2026 to 4:00 AM Wednesday, July 29, 2026.

14h ago 10:00 PM

Caltrans : Roadwork on I-280 Northbound between John Daly Blvd (Daly City) and King St (San Francisco). Lane closed until 3 AM. From 9:00 PM Tuesday, July 28, 2026 to 3:00 AM Wednesday, July 29, 2026.

14h ago 10:00 PM

Caltrans : Roadwork on CA-82 Southbound between John Daly Blvd (Daly City) and School St (Daly City). Various lanes closed until 6 AM. From 8:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

14h ago 9:45 PM

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 7 AM. From 7:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

14h ago 9:45 PM

Caltrans : Roadwork on CA-1 Northbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 8:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

14h ago 9:30 PM

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

14h ago 9:30 PM

Caltrans : Roadwork on CA-1 Northbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

16h ago 8:15 PM

CHP : Traffic Hazard on US-101 Southbound north of Airport Exit (Millbrae). Left lane affected. Expect delays.

16h ago 8:15 PM

CHP : Traffic Hazard on I-280 Southbound north of I-280 S-CA-1 S Join (Daly City). Lane affected. Expect delays.

17h ago 7:15 PM

CHP : Traffic Collision on US-101 Northbound south of CA-92 E (San Mateo). 2nd lane from the left blocked. Expect delays.

17h ago 6:30 PM

CHP : Severe traffic alert and Traffic Collision on US-101 Northbound south of Dore Ave (San Mateo). Left lanes blocked. Expect delays.

18h ago 5:45 PM

CHP : Traffic Collision on US-101 Northbound north of E 3RD Ave (San Mateo). Left lanes blocked. Expect delays.

19h ago 5:15 PM

Caltrans : Roadwork on I-380 Eastbound ramp to US-101 S (South San Francisco). Left lanes closed. Expect delays. From 5:00 PM Tuesday, July 28, 2026 to 8:30 PM Tuesday, July 28, 2026.

19h ago 5:00 PM

CHP : Traffic Hazard on I-280 Southbound north of I-280 S-CA-92 W Ramp (San Mateo). Center lanes affected. Expect delays.

19h ago 4:45 PM

CHP : Traffic Hazard on US-101 Northbound south of San Bruno Ave E (San Bruno). Lane affected. Expect delays.

24–48 hours ago

30 incidents

CHP : Traffic Collision on US-101 Southbound entering at CA-92 E (San Mateo). On Ramp blocked. Expect delays.

CHP : Traffic Hazard on US-101 Southbound north of E Hillsdale Blvd (San Mateo). Right lane affected. Expect delays.

Caltrans : Roadwork on CA-1 Southbound at Bonny Doon Rd (Unincorporated). Lane closed. One way traffic control in effect. From 7:00 AM Tuesday, July 28, 2026 to 5:00 PM Tuesday, July 28, 2026.

CHP : Traffic Hazard on US-101 Northbound south of Broadway (Burlingame). Left lane blocked. Expect delays.

CHP : Traffic Hazard on US-101 Southbound north of E 3RD Ave (San Mateo). Right lanes blocked. Expect delays.

Caltrans : Roadwork on CA-82 Southbound between John Daly Blvd (Daly City) and School St (Daly City). Various lanes closed until 6 AM. From 8:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CHP : Traffic Hazard on I-380 Eastbound west of US-101 S (South San Francisco). Lane affected. Expect delays.

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

1d ago 12:30 AM

Caltrans : Roadwork on US-101 Southbound between CA-92 E (San Mateo) and E Hillsdale Blvd (San Mateo). Various lanes closed until 5 AM. From 8:00 PM Monday, July 27, 2026 to 5:00 AM Tuesday, July 28, 2026.

1d ago 12:30 AM

Caltrans : Roadwork on US-101 Northbound between CA-92 E (San Mateo) and E 3RD Ave (San Mateo). Various lanes closed until 5 AM. From 10:00 PM Monday, July 27, 2026 to 5:00 AM Tuesday, July 28, 2026.

1d ago 12:15 AM

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

1d ago 12:15 AM

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

1d ago 12:15 AM

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CHP : Traffic Hazard on I-280 Southbound north of Trousdale Dr (Burlingame). Lane affected. Expect delays.

Caltrans : Roadwork on CA-1 Northbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 8:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 7 AM. From 7:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

Caltrans : Roadwork on CA-1 Northbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

CHP : Traffic Hazard on US-101 Southbound north of I-380 W (South San Francisco). 4th lane from the left blocked. Expect delays.

CHP : Traffic Hazard on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Right and center lanes affected. Expect delays.

CHP : Residual delays on US-101 Northbound south of Peninsula Ave (San Mateo). All lanes open. Expect delays.

CHP : Traffic Hazard on I-280 Northbound south of CA-92 E (San Mateo). Right and center lanes blocked. Expect delays.

CHP : Traffic Hazard on I-280 Northbound south of CA-92 W (San Mateo). 2nd lane from the left affected. Expect delays.

CHP : Disabled vehicle on US-101 Northbound south of E Millbrae Ave (Millbrae). 2nd lane from the left blocked. Expect delays.

CHP : Traffic Hazard on US-101 Southbound north of Broadway (Burlingame). Lane affected. Expect delays.

CHP : Traffic Hazard on US-101 Northbound south of E Millbrae Ave (Millbrae). Left and center lanes affected. Expect delays.

CHP : Traffic Hazard on I-280 Northbound south of CA-92 W (San Mateo). Right lanes blocked. Expect delays.

CHP : Disabled vehicle on US-101 Southbound north of Broadway (Burlingame). 2nd lane from the left blocked. Expect delays.

CHP : Pothole on CA-92 Westbound east of Upper Skyline Blvd (Unincorporated). Lane affected. Expect delays.

CHP : Severe traffic alert and Traffic Collision with Injuries on US-101 Southbound north of Broadway (Burlingame). Left and center lanes blocked. Expect delays.

Frequently Asked Questions

Are accidents in San Mateo reported live?

Yes — this page refreshes throughout the day as new incidents are logged by the California Highway Patrol. Crash data typically appears within 15–30 minutes of being reported.

How many accidents happened near San Mateo in the last 7 days?

133 crashes were reported near San Mateo in the last 7 days.

What roads have the most crashes in San Mateo today?

Recent crashes near San Mateo are concentrated on: CA-1 S, US-101 S, US-101 N. See the full historical crash data for San Mateo.

What type of accident is most common in San Mateo?

Construction are the most frequently reported incident type near San Mateo based on recent data.

Where does this crash data come from?

Crash data is sourced from the California Highway Patrol (CHP) Computer-Aided Dispatch feed and the CCRS historical crash database. Learn more about our data sources.