From Chief Hosa, Broomfield will be at least a 45 minute drive, and maybe somewhat longer. You'd be as well off, from a time, distance and traffic perspective, to go to St. Vrain State Park just east of Longmont (they have electric). There's also Chatfield State Park in Littleton, on the south side of the metro area, but it wouldn't be fun commuting. There's also the Prospect RV Park in Wheatridge, just off I-70 a little east of Golden. Dakota Ridge RV Park and Golden Clear Creek RV Park are perhaps a little closer in than Chief Hosa. I'm not aware of any campgrounds at all in the Broomfield/Lafayette/Superior or Boulder areas.
The only one of the above that I've stayed at is St. Vrain, which is fairly nice, except for the Interstate noise (I-25 is less than a mile away) and the bugs that are rather plentiful in the morning and evening during warmer weather, due to the small lakes in the park. It's nice to see the pelicans and seagulls, though. The other parks above I mostly found in the 2007 issue of the Trailer Life directory.
May weather in the Denver area can range from 90+ degrees to snowy, though it's rarely much below 30º. If it's snowy, it can range from flurries to several inches. Generally, though, I've turned on my sprinkler system somewhere between late April and mid-May, depending on how much moisture we get and what the season seems to be doing for temperatures. And the change from one condition to the other can come literally overnight, though it's usually more of a 1-3 day change. Most years, though, it's more likely to rain than to snow, though there's often a lot of sunny weather.
Just for perspective, I live in Westminster, about 1/2 mile from the edge of Broomfield, and only about five miles straight line from the Metro Airport/Interlocken area (likely where you are going).
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