No matter where you are Crabgrass seeds need a fairly warm (60 degrees I'm told) soil temperature to germinate. In your area the soil will get there much sooner than it will around here so you will have Crabgrass for a much longer time then I would. Like any other plant Crabgrass seeds need, in addition to the soil temperature, moisture so infrequent but deep watering will help control this stuff. Those seeds also need sunlight to germinate so high grass that limits the amount of sunlight to the your soil will also help.
Keeping what does grow from setting seed will also help, but since birds eat those seeds and then drop them on your soil you will not get total control that way.

Thank you for the information. I guess my question is, does crabgrass have a life span? In my situation, the crabgrass will likely continually have warm weather because of our temperate climate and it will continually have water because I will continue to water the groundcover it is growing in. So if it continues to have heat and water will it live indefinitely or since it is an annual, does it eventually die even if it continues to get adequate heat and water?

Thanks for your input!

Crabgrass is an annual so it germinates, grows, sets seed, and then dies in one year, although you may have more than one crop of it. Corn Gluten Meal is supposed to help keep crabgrass seed from growing once it does germinate, and cutting off the ends of the grass with the immature seeds on them will help some.

Most crabgrass will simply set seed at a very low level if you whack off the top. That's why mowing does almost nothing to control it.

In theory, regular application of a pre-emergent herbicide keeps it under control, but for those of us who try to minimize chemicals it's a lot more work.

Best to work on improving your lawn (which can take years) with top-dressing, aeration if needed, and removing large rocks just below the surface that prevent deep roots if those are a factor. Then you can hand-pull or dig up large clumps of crab-grass and reseed the area in fall with desired grasses.

We have found that most of our thin spots that are prone to crabgrass and weed infestation have biggish rocks about three inches down, preventing the good grass from taking hold. (Our house is a new construction). We have gradually been improving all our thin spots. Usually if you have lots of weeds and crabgrass there are no fixes that are not labor-intensive.