Where a car has lived matters more than its odometer, and where you live decides what the hobby costs you.
Minnesota is a genuinely excellent place to do this, and the numbers support the claim. The state has 2.4 million registered vehicles, of which 274,000 are at least 20 years old and collector-plate eligible, with roughly 24,000 built before 1950 in the Department of Public Safety's counts. Hagerty has ranked Minnesota the friendliest state in the country for classic cars, and RotoWire's scoring put it first with 840 points out of 900, ahead of Kentucky at 820, across criteria covering registration, inspections, taxes, emissions, titling, road quality, traffic, and weather. Back to the 50s at the State Fairgrounds every June pulls more than 10,000 owners of cars at least 60 years old.
One correction, since we went looking for the number: Minnesota ranks sixth among the 50 states for sheer quantity of collector cars, and its first-place finish is for friendliness, which scores the rules and the roads rather than the count. The reason so many cars live here is less exotic than any statistic. People have garages, January is long, and a heated garage in January beats almost anywhere else in the state.
The tradeoff is rust. An unrestored Minnesota car, and especially one stored outdoors, hides corrosion in the rockers, the floors, and the frame rails, in the places you cannot see without a jack and a flashlight. Southern cars have the opposite disease. Sun destroys dashboards, cracks door cards, and turns interior plastics to biscuit, and on a car that saw a 500-unit production run those pieces get genuinely hard to find. A sun-baked car wears its damage above, and a salted car rots from below. Warmer, drier climates generally produce the better starting point for anybody who would rather not learn to weld.