St. Helena, CA truck route planning & crash data
Plan safer truck routes in St. Helena: commercial truck and garbage truck crashes in St. Helena and Napa County, dangerous roads, seasonality and route safety data for fleets. Patterns use Napa County numbers.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
10 of 561 truck crashes since 2015.
Deadliest roads
How Napa County compares with California
Napa County against California and the US, 2015–2024 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Napa County stands out
Full comparison
| Measure (2015–2024) | Napa County | California | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 39.2 | 33.2 | 49.7 | 1.2× the state |
| Deaths per 100 crashes | 3.5 | 3.6 | 3.4 | same |
| Injuries per crash | 0.50 | 0.44 | 0.49 | 1.1× the state |
| Garbage-truck share | 1.9% | 1.6% | 2.3% | 1.2× the state |
| On snow, slush or ice | 0.4% | 0.9% | 6.2% | 59% below the state |
| Morning rush (6–10 am) | 29.8% | 23.5% | 23.7% | 1.3× the state |
| In rain, sleet or snow | 7.5% | 6.5% | 13.8% | 1.2× the state |
| Winter months (Nov–Mar) | 38.3% | 40.2% | 41.9% | same |
| After dark | 12.3% | 29.1% | 24.8% | 58% below the state |
Compared with California, Napa County is lower on on snow, slush or ice and after dark. Where it is higher: crashes per 100k residents / yr, injuries per crash and garbage-truck share.
The headline for St. Helena: SR-12 deadliest road: 3 fatal truck crashes within 10 miles of St. Helena since 2015.
Overview
Napa County has recorded 561 truck crashes since 2015, with 276 people injured and 19 killed.
Across the years with complete reporting, that is roughly one truck crash every 7 days.
St. Helena had 15 reported truck crashes since 2015, too few for reliable patterns, so the charts and findings on this page use Napa County numbers.
When crashes happen
October has the most truck crashes, 10.9% of the yearly total, while January has the fewest (6.2%).
The five winter months (November to March) hold 38.3% of truck crashes, against 40.2% across California.
More truck crashes happen at 11 am–12 pm than at any other hour (8.9%).
Road surface: 0.4% of truck crashes were on snow, slush or ice (California: 0.9%).
Where crashes happen
The deadliest road for trucks within 10 miles of St. Helena is SR-12, with 3 fatal large-truck crashes since 2015. It is followed by SR-128 (2), SR-29 (2) and Oakville Grade Rd (1).
Garbage & waste trucks
Garbage trucks account for 10 of the truck crashes here, or 1.8%, compared with 1.6% in California.
Route planning tips for St. Helena fleets
- Review driver schedules for October, the month with the most truck crashes.
- Where you can, review stops along SR-12; it has the most fatal large-truck crashes nearby.
- Morning starts matter: 29.8% of truck crashes fall between 6 and 10 am, higher than California.
- Paste your stops into the free Route Planner to see the risk score, safer alternatives and low bridges.
About the data
Sources: the FMCSA crash file for all reported truck crashes and NHTSA FARS for fatal crashes with a large truck. Every statement here comes straight from those numbers.
Crash reporting for 2025 is incomplete; those years are shown in grey and not used for rates.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Napa County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| SR-12 | 3 |
| SR-128 | 2 |
| SR-29 | 2 |
| Oakville Grade Rd | 1 |
| Petrified Forest Rd | 1 |
| Silverado Trl | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Napa County) |
|---|---|
| SR-29 | 12 |
| Rt128/Petrified Forest Rd | 5 |
| Rt29/Deer Park Rd | 3 |
| Rt12/Rt29 | 3 |
| Big Ranch Rd/662Ft N Salvador Av | 2 |
| Broadway/Eucalyptus Dr | 2 |
| Broadway/Green Island Rd | 2 |
| Broadway/Paoli Loop Rd | 2 |
St. Helena at a glance
| Population | 5,257 |
| Land area | 5.0 sq mi |
| Density | 1,060 per sq mi |
| Median household income (ZIP 94576) | $170,677 |
Waste facilities and haulers nearby
Historical data: truck crashes in Napa County since the 1990s
Combines the FMCSA crash file (all reported truck crashes, real coverage from about 1990) with NHTSA FARS (fatal crashes involving a large truck, 1982–2024).
| Decade | Truck crashes / yr | Change | Fatal crashes / yr (FARS) |
|---|---|---|---|
| 1990s | — | — | 1.7 |
| 2000s | 32 | — | 1.2 |
| 2010s | 45 | +41% | 1.3 |
| 2020s | 52 | +16% | 1.8 |
From the 2000s to the 2020s, yearly reported truck crashes went from 32 to 52. Some of the change may reflect how crashes were reported. Fatal large-truck crashes: 1.5 a year in 2016–19, 1.8 a year in 2020–24.
Nearby places
Questions fleets ask about St. Helena
How common are truck crashes in St. Helena?
Since 2015, 561 crashes involving commercial trucks were reported in Napa County (276 injured, 19 killed).
Where do fatal truck crashes happen most in St. Helena?
NHTSA data shows SR-12 with 3 fatal large-truck crashes within 10 miles of St. Helena since 2015, the highest of any road.
When do most truck crashes happen in St. Helena?
Truck crashes in Napa County peak in October, with 10.9% of the year's crashes.
Are garbage truck crashes common in St. Helena?
10 crashes involving garbage or refuse trucks have been reported in Napa County since 2015, 1.8% of all truck crashes.
How do truck crashes in St. Helena compare with California?
Napa County records 39.2 truck crashes per 100,000 residents a year, against 33.2 across California.
What is the best way to plan truck routes in St. Helena?
Use the free Route Planner: enter your stops to get a risk score, safer alternatives and the low bridges on your route.
Crash reporting to FMCSA was incomplete in 2025; those years are greyed out and left out of rates. 2026 is a partial year. Updated October 2026.