Ask for the printout
An alignment produces numbers. Most people never see them, which is a pity, because they are the part that tells you whether the job was worth doing and when it will need doing again.
What you want is the before and after figures for each wheel, against the manufacturer's specification.
The before figures tell you how far out the vehicle actually was. A vehicle barely outside specification was not the cause of whatever brought it in, and that is useful to know before you conclude the problem is solved.
The after figures show it is now within specification, which is the thing you paid for.
The two together tell you how fast this vehicle moves. One that drifted slightly over three years is a different proposition from one that went well out in six months, and the second is usually telling you about a worn component rather than about alignment.
Keep them. The next alignment means considerably more when there is something to compare it against.
When to book it
The national alignment page lists the occasions that apply to any vehicle. The one specific to northern Colorado is the calendar: after winter rather than before it, because freeze and thaw breaks pavement up and the worst of the road surface arrives in spring.
A spring alignment also gives you a figure to compare the following spring against, which is the point of keeping the paperwork.
What alignment cannot do
Fix a worn part. A vehicle that will not hold an alignment has something moving under load, and that is suspension repair, done at this store, with the alignment afterwards.
Fix a vibration. That is balance, or a wheel.
About this store
The Loveland store runs sixteen services, carries all nine Purcell tire categories, opens at 7:00 AM, and is managed by Joe Servin. It also aligns heavy trucks and trailers.
See the national car and light truck alignment page for all 40 locations.