Not sure how good it is because I didn't sign up. It looks like it only provides info for 12 common veggies. Have a look at this planting calendar for the low desert and see how it compares. No sign-up required. :)

Here is a link that might be useful: Low Desert Planting & Harvest Calendar

Thanks haname: Urban Farm, Matt Suhr and Greg Peterson calendar is the one I have been using. Both calendars are close and yes lets grow veggies site is limited in the vegetables but has a weekly to do list. I know from my garden this year - came out bad, but still working on the soil, city of Maricopa and 11 miles to where I live (Hidden Valley) is alot different in temps and rain fall. I guess I need to learn to work with in my own mini enviroment and keep trying to see what works for me in the garden.I have gotten alot of good info from this site.