Minnesota ranks second; North Dakota, fourth; Wisconsin, sixth; Iowa, eighth in the 2018 survey. Massachusetts is first. New Hampshire (3), Vermont (5), New York (7) and Nebraska (9) round out the list. The only warm state to make the top 10 is California, coming in at No. 10 — but as everyone knows, northern California gets plenty of snow and ice.Seriously, though, it's the well-being of children that matters and the survey's findings make it clear that parents' economic opportunities are key.