Does any one know of any Colorado resorts that dont close in April?

2 that come to mind quickly are:

Loveland
Arapahoe Basin

Most stay open through April but tend to close near the end of the month. May gets tricky but Loveland and A-basin give it a go as long as they can. A-basin has been known to stay open to July 4th on good years.

I'm going out there soon and have looked at this closely. Most will close by Apr 15, Breckenridge closes Apr 22. Believe only A-basin and Loveland open after that and both vary their closing date depending on snow pack. A-basin is known to make it well into June.
BTW, fresh snow out there today.

Just heard Vail open until Apr 22nd also. Loveland usually goes until mid-May

Here's some very definitive closing date info for CO:
http://media-coloradoski.com/CSCFacts/OpeningAndClosingDates/

Silverton and Echo Park also go to May.

I have 2 business meetings there in late May and hope to find some skiing over a weekend. I will try to ski A Basin one day and backcountry another. I'd like to do Independence Pass.
http://www.independence-pass.com/pictures.htm
Notice the ski tracks in one of those Memorial Day pictures. In a normal year the road opens in late May so the window should be perfect. Loveland Pass is another easily accessed possibility, as is St. Mary's glacier, which I have skied in Aug.

That looks like a great place; I will have to keep that in mind next time I am in CO on travel (I always get sent out there when it's not prime ski season, but it looks like May might be an OK month to go).

You have to keep a very watchful eye on the weather. Colo. mountain thunderstorms are downright scary and can develop rapidly. Peak season is late summer but it can happen in May also. I've been chased from above timberline areas several times.