Car crash statistics in San Dimas, CA

We don't rate cities as safe or unsafe: crash counts can't say how risky a street is, and busy streets have more crashes partly because more people use them. This page covers traffic crashes, not crime. What the records show: 2,240 crashes were reported in San Dimas from 2021–2025, 734 with an injury and 11 with a death. 33% (California: 40%) of crashes injured someone. 19% (California: 25%) were hit-and-run.

• 33% (California: 40%) of crashes injured someone.
• 19% (California: 25%) were hit-and-run.
• 22% (California: 26%) happened between 8 p.m. and 6 a.m.
• The busiest hour was 5 p.m. (California: 5 p.m.).
• 49% were on a freeway.

Set against all reported crashes in California, 2021–2025. Without traffic counts these can't say how risky a street is.

The main cause the reporting officer recorded, as a share of all 2,240 crashes. It is the officer's judgement at the scene.

• Unsafe speed29% · 645
• Straying from the lane or driving on the wrong side19% · 417
• Unsafe turning or lane change15% · 340
• Failing to yield at an intersection or to turn10% · 227
• Running a red light or stop sign6% · 131

By type of collision: rear end 31%, side swipe 28%, hit object 16%, broadside 15%.

The latest year can rise as late reports come in, and some police departments file months late.

• 30 crashes (1%) involved a pedestrian. See where they cluster
• 45 crashes (2%) involved a bicyclist. See where they cluster
• 44 crashes (2%) involved a motorcyclist. See where they cluster

How many car accidents happen in San Dimas each year?

Reported crashes in San Dimas: 2021: 442, 2022: 429, 2023: 446, 2024: 482, 2025: 441. The latest year can rise as late reports come in, and some police departments file their reports months late.

What time do most crashes happen in San Dimas?

The busiest hour for reported crashes in San Dimas is 5 p.m.. 22% (California: 26%) happened between 8 p.m. and 6 a.m.

What causes crashes in San Dimas?

The main cause the reporting officer recorded, as a share of all 2,240 crashes: unsafe speed 29%, straying from the lane or driving on the wrong side 19%, unsafe turning or lane change 15%, failing to yield at an intersection or to turn 10%, running a red light or stop sign 6%.

How many people were killed in crashes in San Dimas?

11 crashes killed someone in 2,240 reported crashes in San Dimas from 2021–2025, and 734 crashes injured someone.

How many crashes in San Dimas involve pedestrians, cyclists or motorcyclists?

30 involved a pedestrian (1%), 45 involved a bicyclist (2%), 44 involved a motorcyclist (2%), of 2,240 reported crashes from 2021–2025.

Where does this data come from?

Police crash reports in the California Crash Reporting System (CCRS), published by the state on data.ca.gov. Every reported crash is counted, whatever the vehicles, and no locations are used.