Installing lawn in in the warmer months is the ideal time but that doesn't mean you can't lay your lawn in winter too. There are even a few benefits in establishing a lawn in the cooler times of year too.
There is a common misconception that installing a new warm season turf like Sir Walter DNA Certified cannot be done in the cooler months. This isn't true, as turf is installed successfully all year round anywhere in Australia, especially in our warmer climate (even though it doesn't feel too warm!)
A benefit in laying a new lawn in winter is lower water usage; in the cooler months, you will not have to water your new lawn anywhere near as much compared with the warmer months as the days are not hot enough to dry out your new turf. Whilst it still needs some water, you can virtually halve your water usage by laying turf in winter and still maintain a healthy lawn come spring. Another benefit is you wont have to mow your lawn until the weather warms up. This comes in very handy as the winter months have shorter days and weekends filled up with sport and other activities which makes it much harder to find the time.
Just keep in mind, when laying a new lawn in winter the lawn will not root down properly until the weather warms up and it starts growing again. This doesn't mean anything is wrong, and your lawn isn't dying. It is simply sitting idle until it gets some warmer temperatures so it can fully establish.
This blog post was sourced from the Lawn Solutions Australia blog page; http://www.lawnsolutionsaustralia.com.au/blog/installing-a-new-lawn-in-winter/