Have you gotten any of the rain that has gone through CO? If so, you can fertilize just about any time. The main thing you want to avoid is fertilizing while it's still hot and dry. If you've gotten some of the rain, it probably also means it has started to cool off, so you should be fine.

On my cool season grasses I like to use 3 apps of organic fertilzer at 10 to 20 lbs per 1000. One in May, one in sept, one in Oct and then when I get my first hard freeze, I put out ONE pound of quick release nitrogen (used urea last year).

Of course, there are other ways to skin that cat.

Thanks for the info! Although we did get alot of rain, it seems they are expecting low 90's again in a few days.

bpgreen, I have to say I'm kind of disappointed in my ephraim crested wheat grass. It looked great in spring, spent the entire summer brown even though I watered it, and it's still brown. It really does need as much water as bluegrass to stay green. The only spots that were green were the sections that got watered once a week along with the bluegrass. The only thing I'm happy about is that it wasn't clumpy like other native style grasses.

Carol

I've been unimpressed by the Roadcrest crested wheatgrass I planted, also. It seems to go dormant as soon as it gets a little stressed. I think it can stay green with less water than bluegrass, but from what I've seen, crested wheatgrass and streambank wheatgrass both survive severe drought, but they do so by going dormant very fast.

Western wheatgrass stays green much longer with much less water. But if it does go dormant, the water has to go deeper into the soil before it'll come out of dormancy because the majority of the roots are deep in the soil.

Blue grama is supposed to stay green with little or no water in the heat of summer. The drawback is that it has a shorter green season. It's somewhat of a bunch grass, but I've read that it spreads at higher altitudes, and it also spreads when it is mowed.

I use a 5 application fertilizer schedule from Lesco. It is the best fertilizer I have ever used and my lawn is immaculate. I'm guessing you have irrigation, so rain is not much of an issue. I apply every 2 months with slow release fertilizers so I'm not mowing 3 times a week. Here are the products I have used the past two years.
Late March - 19-0-6 Dimension (preemergent + fertilizer)
May - 24-5-11 3Fe
July - 5-10-31 10Fe
Sept - 24-8-15 or 24-5-11 3Fe
Late Oct, Early Nov - 21-0-0

Last year I didn't do the "winterizer" application and it still looked great.
Lesco has 2 locations in Denver. 1 off of Evans and Santa Fe, and 1 off of I-76 and Sheridan.
I also use a product called Speedzone for broadleaf weed control. It is a liquid herbicide and works amazing. Good luck!