ZIP 78666 (San Marcos, TX) truck route planning & crash data
Plan safer truck routes around ZIP 78666: commercial truck and garbage truck crashes here and in Hays County, dangerous roads, seasonality and route safety data for fleets.
Where fatal truck crashes happened
Risk scorecard
Key findings
Snapshot
Crashes by month
Garbage trucks vs all trucks
9 of 1,691 truck crashes since 2015.
Deadliest roads
How Hays County compares with Texas
Hays County against Texas and the US, 2015–2025 (years with complete crash reporting). Per-resident rates make big and small places comparable.
Where Hays County stands out
Full comparison
| Measure (2015–2025) | Hays County | Texas | United States | vs state |
|---|---|---|---|---|
| Crashes per 100k residents / yr | 49.8 | 62.9 | 49.7 | 21% below the state |
| Deaths per 100 crashes | 3.8 | 4.1 | 3.4 | 7% below the state |
| Injuries per crash | 0.61 | 0.58 | 0.49 | same |
| Garbage-truck share | 0.6% | 1.1% | 2.3% | 49% below the state |
| On snow, slush or ice | 0.2% | 1.7% | 6.2% | 85% below the state |
| Morning rush (6–10 am) | 20.9% | 22.6% | 23.7% | 8% below the state |
| In rain, sleet or snow | 7.7% | 11.3% | 13.8% | 32% below the state |
| Winter months (Nov–Mar) | 39.1% | 40.8% | 41.9% | same |
| After dark | 30.8% | 27.0% | 24.8% | 1.1× the state |
Hays County sits below Texas on crashes per 100k residents / yr, deaths per 100 crashes and garbage-truck share. It stands out for higher after dark.
Hays County at a glance: 0.2% of truck crashes happened on snow, slush or ice, vs 1.7% in Texas.
Overview
Hays County has recorded 1,691 truck crashes since 2015, with 1,043 people injured and 62 killed.
In complete reporting years that works out to about one truck crash every 3 days.
When crashes happen
Truck crashes peak in August (10.0% of the year) and are lowest in November (7.2%).
November through March accounts for 39.1% of truck crashes here, compared with 40.8% in Texas.
The busiest hour is 1–2 pm, with 7.2% of truck crashes.
0.2% of truck crashes here happened on snow, slush or ice, against 1.7% across Texas.
Where crashes happen
Within this area, I-35 had the most fatal crashes involving a large truck since 2015 (25). Next come SR-123 (6), Fm 306 (2) and CR-WATSON Lane (1).
Garbage & waste trucks
9 crashes involved a garbage or refuse truck, a 0.5% share (Texas: 1.1%).
Route planning tips for ZIP 78666 fleets
- Build extra time into August routes: it has the most truck crashes here.
- Check whether your routes use I-35, the road with the most fatal truck crashes in this area.
- Use the free Route Planner to score your route and spot low bridges before drivers head out.
About the data
Crash counts come from the FMCSA crash file (police-reported crashes involving trucks over 10,000 lb); fatal-crash locations come from NHTSA FARS. Text on this page states only what these numbers show.
Truck crashes by year: all trucks vs garbage trucks
Seasonality: when trucks crash in Hays County
By hour of day
Most dangerous roads for trucks
| Road | Fatal truck crashes since 2015 (within 10 miles) |
|---|---|
| I-35 | 25 |
| SR-123 | 6 |
| Fm 306 | 2 |
| CR-WATSON Lane | 1 |
| Fm 621 Staples Rd | 1 |
| I 35 Frontage | 1 |
| Mu-Hoffmann Ln | 1 |
| Rm 110 | 1 |
| SR-80 | 1 |
Roads named most in all truck crash reports
| Road | Truck crashes since 2015 (Hays County) |
|---|---|
| I-35 | 70 |
| Camino Real | 32 |
| Hunter Rd | 21 |
| SR-123 | 15 |
| Wonder World Dr | 12 |
| Camino Real Rd | 11 |
| Sh 123 | 11 |
| N 2800 Ih 35 | 10 |
ZIP 78666 at a glance
| Population | 88,583 |
| Density | 178 per sq mi |
| Median household income | $54,737 |
| Median home value | $301,523 |
| Home ownership | 38% |
Waste facilities and haulers nearby
Historical data: truck crashes in Hays 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 | 58 | — | 1.4 |
| 2000s | 82 | +41% | 3.0 |
| 2010s | 112 | +37% | 3.9 |
| 2020s | 160 | +43% | 4.2 |
Reported truck crashes averaged 58 a year in the 1990s and 160 a year in the 2020s. Reporting practices changed over time, so part of any change can come from reporting. NHTSA counts 5.2 fatal large-truck crashes a year in 2016–19 and 4.2 a year in 2020–24.
Nearby ZIP codes
Questions fleets ask about ZIP 78666
How common are truck crashes in ZIP 78666?
Hays County has had 1,691 reported truck crashes since 2015, injuring 1,043 people and killing 62.
Which road has the most fatal truck crashes in ZIP 78666?
NHTSA data shows I-35 with 25 fatal large-truck crashes within 10 miles of ZIP 78666 since 2015, the highest of any road.
When do most truck crashes happen in ZIP 78666?
Truck crashes in Hays County peak in August, with 10.0% of the year's crashes.
How many garbage truck crashes are there in ZIP 78666?
9 crashes involving garbage or refuse trucks have been reported in Hays County since 2015, 0.5% of all truck crashes.
What is the truck crash rate in ZIP 78666 compared with Texas?
Hays County records 49.8 truck crashes per 100,000 residents a year, against 62.9 across Texas.
How can I plan a safer truck route in ZIP 78666?
The free Route Planner takes your stops and returns a route risk score, safer alternatives and low-bridge warnings.
2026 is a partial year. Updated October 2026.