Every winter the Sun Belt fills up with part-time residents and out-of-state plates, and every winter the locals blame them for the traffic. Two years of Arizona crash data say the opposite — and the real story is more interesting than the stereotype.
Ask anyone who lives in metro Phoenix what happens in February and you will get some version of the same answer: the freeways clog, the left lane slows down, and the parking lots fill with plates from Alberta, Minnesota and Michigan. Snowbird season is a running local joke, and the punchline is always the same — watch out, the winter drivers are back.
It is a satisfying story. It is also, according to the state’s own crash records, wrong.
The Arizona Department of Transportation publishes an annual volume called Motor Vehicle Crash Facts, and buried in it is a simple table: every crash in the state, sorted by the month it happened. Pull two consecutive years and a pattern turns up that is hard to square with the stereotype.
In 2024, Arizona recorded 121,107 crashes. The busiest month was September, with 11,182. The two quietest months of the entire year were February (8,546) and March (8,870).
In 2023, out of 122,247 total crashes, the busiest month was June, with 11,168. The two quietest were March (8,752) and February (8,900).
Normalize for the fact that February is a short month and the gap gets wider, not narrower. Arizona averaged about 331 crashes a day across all of 2024. In February it averaged 295, and in March, 286. September ran at 373 a day and June at 353. The peak of snowbird season runs roughly 20 percent below the state’s worst stretch — and the pattern repeats in both years, with March landing dead last both times.
There is a reasonable objection here: that is the whole state, and Arizona contains Flagstaff, where winter means ice and closed passes. But Maricopa County alone accounted for 88,094 of 2024’s 121,107 crashes — 72.7 percent of everything the state recorded. The statewide monthly curve is, arithmetically, already mostly a Phoenix curve. And whatever northern-Arizona winter crashes are folded into it push the February and March numbers up, not down. The dip survives them anyway.
March is peak winter-visitor season in Arizona. It is also spring training, when fifteen Cactus League teams pull well over a million fans into the Valley. And it is, two years running, the safest month on Arizona’s roads.
Why the intuition fails
The assumption underneath the snowbird complaint is that older drivers crash more. At the population level, in Arizona, they demonstrably don’t.
As of the end of 2024, Arizona had 5,940,043 licensed drivers. Drivers 65 and older made up 21.5 percent of them — about 1.28 million people. But of the 236,193 drivers involved in crashes that year, only 10.4 percent were 65 or older. Older drivers are roughly half as likely to turn up in a crash report as their share of the licensed population would predict.
That is not an Arizona quirk. Older drivers self-regulate in ways younger drivers don’t: they drive fewer miles, avoid night driving and bad weather, skip rush hour, and stay off unfamiliar high-speed roads. A retiree with no commute is not making the two most dangerous trips of the average American’s day.
So the winter influx is not adding a population of unusually crash-prone drivers. It is adding a population of unusually cautious ones, at a time of year when Arizona has no monsoon, no dust storms, no 115-degree pavement and no summer-vacation road-trip traffic.
What does change
Here is where the data stops being reassuring.
The Insurance Institute for Highway Safety has been clear for years that the elevated fatality risk among older drivers is mostly not a driving-skill problem. In the IIHS framing, that risk is driven largely by greater susceptibility to injury — particularly chest injuries — and to medical complications afterward, rather than by any greater tendency to crash in the first place. A collision a 35-year-old walks away from can put an 80-year-old in an ICU. In 2024, 5,679 people aged 70 and older died in U.S. motor vehicle crashes.
The crash type shifts too. IIHS data shows that 43 percent of fatal crash involvements among drivers 80 and older are multiple-vehicle intersection crashes, against roughly 24 percent for drivers aged 20 to 64. That is the unprotected left turn, the gap-judgment error, the “I didn’t see them” collision.
Which makes the Phoenix street grid a genuinely bad match for the demographic that visits it. The Valley is built on a mile-by-mile grid of six- and seven-lane arterials with 45 mph posted limits and long cycle lights. Judging a gap across three lanes of oncoming traffic moving at 50 is a harder perceptual task than almost anything a driver faces in the older, narrower Midwestern cities many winter visitors come from. The crash count does not rise. The consequences of the crashes that do happen get worse.
Nobody actually knows how many there are
One more thing worth saying plainly, because it gets asserted constantly and sourced almost never: no one has a reliable count of Arizona’s winter residents.
The definitive academic treatment is a paper by Stephen Happel and Timothy Hogan of Arizona State, published in Population Research and Policy Review in 2002, and its title tells you everything — “Counting snowbirds: The importance of and the problems with estimating seasonal populations.” Their conclusion, two decades on, still holds: you cannot count a population you cannot define. Is a six-month resident a snowbird? A six-week one? Someone who owns the condo but rents it out in July? The Census does not capture them, and the estimates that circulate in news coverage trace back to methodologies that were shaky when they were new.
So when you see a confident figure for how many snowbirds Arizona gets, treat it the way you would treat a horsepower claim with no dyno sheet behind it.
The part that catches people out
The crash that does happen in February is, administratively, a much messier event than the one that happens in July — and this is the practical thing worth knowing if you spend winters somewhere other than where your license was issued.
Arizona is an at-fault state operating under pure comparative fault, codified at A.R.S. § 12-2505. A driver found 20 percent responsible for a collision can still recover 80 percent of their damages. That is a meaningfully different rule from the modified comparative systems in place across much of the Midwest, where being 51 percent at fault can zero out a claim entirely, and from the no-fault regimes in Michigan, Minnesota and elsewhere. Visitors routinely assume the rules they know follow them across state lines. They do not.
Insurance is its own trap. Most auto policies extend coverage when you drive in another state, but Arizona’s minimum liability limits — $25,000 per person, $50,000 per accident, $15,000 property damage, raised to those figures on July 1, 2020, after more than four decades unchanged — are thin against a modern medical bill, and a serious injury to an older occupant can exhaust them before the first surgery is paid for. Phoenix auto accident attorneys field a predictable seasonal wave of exactly these multi-state coverage questions every winter, and the recurring theme is a visitor who assumed their home-state policy and their home-state rules came along for the drive.
The season to actually worry about
If you want to know when Arizona driving is genuinely dangerous, the crash table already told you: late summer into early fall. June and September were the worst months in the two years examined here. That is monsoon season — microbursts, flash flooding, and the dust storms that can drop visibility on I-10 from a mile to zero in under a minute.
The winter visitor in a spotless sedan doing 38 in a 45 is not the thing that makes Arizona roads dangerous. He is just the thing that is easy to notice.
Matthew Wilde
Matthew Wilde is an automotive journalist with experience contributing to leading publications. He focuses on delivering clear, well-researched analysis of automotive industry news and vehicles. Growing up surrounded by a variety of cars, Matthew developed a strong foundation in automotive technology and design. His work emphasizes accuracy and depth, aimed at informing both enthusiasts and industry professionals with straightforward, precise reporting.
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