Some friends and I are planning a camping trip to Colorado, hopefully over the Memorial Day holiday.
The only requirement I know of is that it must have modern showers. A lot of websites say “amenities” but that could mean anything.
Some questions:
Any good campsites to recommend?
Is it way too late to make reservations?
How much should we expect to pay?
Are we crazy to go camping this early in the summer?
Thanks for your input.
This is really the only one I can answer for you, as when I go camping, I go backpacking. But, the good news for you is that, while any other year you would need to be reasonably picky about where you go, this year should be good for earlier camping. Memorial Day will be chilly in higher elevations at night, but otherwise should be fine. There’s not a vast amount of snow left up there.
I can’t recommend campsites (“There! By that log!”), but I can recommend an area. The Yampa River area, by Steamboat Springs, is beautiful this time of year, and of a low enough elevation that the temps are reasonable, and you flatlanders don’t get all woozy from the altitude. 
Yeah definitely Steamboat Springs. It is just beautiful up there. We have stayed in a couple different campsites, but the only one I can remember is called Pearl Lake.
Have fun!
Like Necros, camping for me is a bit more primitive than you are thinking about. I don’t know what you’re used to regarding weather, but it is not unknown to snow in the high country in May and June. In fact, I got caught in a blizzard near Long’s Peak in August. It will be chilly at the very least.
Rocky Mountain National is very popular, but you better get reservations in very soon for that one, but it sounds like it might be your kind of camping. The Yampa area can be pretty cold even over Memorial Day.
Come to think about it, If you are going any place near showers in Colorado over the Memorial Day weekend, you will probably have to have reservations.
TV
Agreed. There are a few million people along the Front Range competing for those places. Over the summer holidays, the national forests are chock full of campers, many of whom camp far more primitively than what you’re looking for… you may indeed be too late form a reservations standpoint.
My preference is Independence Pass, near Twin Lakes, but I don’t think there are any established (read: “with showers”) sites around there.
that’s ok… just pitch a tent on the greenbelt behind my house. You’ll be in the perfect spot to catch all the Memorial Day backyard barbeques! 
I have to say, I haven’t found a place in Colorado that I did not enjoy camping. Pretty hard to go wrong in my opinion.
The KOA’s are pretty cliche’, but there are some nice ones out here in you need “ammenities”. Colorado Camping Locations | KOA Campgrounds
Number 19 on the map is out almost to Walden (nice drive through the Poudre River Canyon on the way). The area is known for moose sightings, if you’re looking for something different.
I’ll reiterate what everyone else said; camping in Colorado over Memorial Day weekend is going to be crowded and cold. If you don’t have reservations at campsites, get them - the chances that the camp grounds will be full are very good. Also double your driving time if you’re going anywhere near Denver. The traffic is horrendous.
You’d be a bit better off if you were willing to backpack in somewhere - it’s amazing how things clear up when your 2-3 hours off a trail. But I doubt you could backpack in somewhere that includes modern showers.
I camped at two wonderful places on Colorado, somewhat between what you may be looking for and what the two posters here described. I.e. you drove in, but there were no showers.
Unfortunately, I can’t remember where the hell they were, and my descriptions sound like just about every campground in Colorado.
One was in a very steep valley, with a spur road coming into the valley after spending about 5 miles in a grassy plain. The views of the valley were awesome: I can’t believe how steep the sides were at such a low altitude (I didnt feel at high altitude at all)
The second place was equally amazing for being at a non-high altitude: I estimate it was actually in the 6-7500 foot range, but there were succulent-looking large tundra-type wildflowers of every color dotting the plain we camped at! We were sort of in a bowl between hills that rose up 1-1500 ft, and our car had to ascend into the plain.
I actually can remember somewhat of where that was: it was close to Denver. That’s as much info as you’ll get 
I know of one, gorgeous views, great hiking, fishing, and camping, relatively close to towns with motels and restaurants. But no showers. So I ain’t gonna tell ya.
I also don’t want to publisize it, because it is so great. Eventually the word will get out, but right now it is exactly the way I like it.
I know a place in Utah like this, too, but it is much harder to get to.
Some things are worth preserving in their current state. That sounds snarky, and I don’t have an immediate justification for it, but I’ll bet most people have a spot that they feel the same about.