A lot of older gardeners hold with turning over the soil before a frost. Letting the frost get into the soil. They say it kills of weeds and pests. In this garden, prone to slugs, it certainly does make some difference for later in the spring.
It is good to see a frost after several winters without any. It indicates the weather might follow a more normal course this year, a winter then a spring. This is important for hardening off plants later.