There is almost no diversity in Colorado when compared with the large coastal cities. You may still be welcomed but don’t expect to see many Asians or Asian restaurants and stores.

Not super diverse but diverse enough to not be gawked at. There's a fair amount of Chinese and Indian tech people who moved there with families.

Maybe a short family weekend trip is in order. SF is getting so outrageously expensive.

You might want to check out the area between Boulder and Denver too. It's mostly never ending suburbia in a sense but at least you have both Boulder and Denver open to you for employment options if you live there. There's also some quaint places with smaller town feel like louisville.

Commuting from Longmont to Denver is possible but would be a lot of hours driving/on a bus. A rail link is planned but it is scheduled for something ridiculous like 2050 or sometime infinitely far in the future.

Northern Colorado is a great place to live but unfortunately not very diverse.