I gather this may vary by state, but in NH at least (since 2006), rational basis review is the standard used for judicial review of zoning regulations/ordnances.
The [NH Supreme] Court held that the rational basis test under the state constitution requires that legislation be only rationally related to a legitimate governmental interest. Further, the Court held that the rational basis test “does not contain an inquiry into whether legislation unduly restricts individual rights, and that a least-restrictive-means analysis is not part of this test.”
In so holding, the Court overruled two earlier cases to the extent that they don’t comply with the newly enunciated rational basis test: Metzger v. Town of Brentwood, 117 N.H. 497 (1977), which held that requiring 200 feet of frontage was unconstitutional where 123 feet “provided ready access,” and Powers v. Town of Hampton, 125 N.H. 273 (1984), which held that requiring a 24-foot wide fire lane was unconstitutional where 15 feet was sufficient. These cases factored a least-restrictive-means analysis into the rational basis test, which the Court has now ruled inappropriate.
I could not easily find out if this is typical of other US states as well... or not. So, is there some kind of review/resource summarizing the state-level standards used to review zoning regulations?