Despite some recent frosts and freezes across certain spots in Indiana, crabgrass remains unaffected and was not killed. Although crabgrass was not injured, other cold sensitive plants were such as volunteer tomato seedlings in my garden and my Japanese maple.
Recent cold air temperatures cooled down our soil temperatures. Temperatures will be mild for the next 10+ days. When they being to rise again in the next couple of weeks, expect the second flush of crabgrass germination to begin in late April.