Black widows are common in Utah, not rare, and worth taking seriously without treating every dark spider as one.
Black widows turn up reliably along the Wasatch Front in the same kind of spots — woodpiles, window wells, meter boxes, the undisturbed corner of a garage or shed, anywhere dark and low that does not get moved or swept often. That is a description of habitat, not an epidemic, and most Utah homes deal with a handful a year rather than an infestation.
The identification question matters more than the treatment question. A shiny black spider with a red marking on the underside is worth flagging; most other dark house spiders are not black widows and do not need the same response. A licensed applicator can confirm what you are looking at and treat the specific areas where they tend to hide, rather than blanket-spraying a whole yard for a spider that was never there.
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