Even though the ground is frozen, and the turf is dormant, winter can be a good time to apply lime to the turf. Anytime from fall to late winter is good due to the rain, snow, freezing/thawing activity in the soil, aiding in the incorporation of the limestone into the soil profile.
The sole purpose of the lime application is to reduce the acidity of the soil, allowing the grass plants to better use the nutrients available for growth and color all season. A soil test to determine the actual pH of the soil is a good idea, especially in new lawns. Once the lawn is established and doing well, a "maintenence" level of lime can be applied on an annual basis to keep the pH in check. Turfgrass requires a pH in the range from 6.0 to 7.0. So if you're thinking of doing something for the turf in winter, consider liming the soil, it may be your best option.
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