03/25/2026
What you may be currently seeing in your lawn are random yellow spots approximately the size of your fist or slightly bigger, some even connected or irregular in shape. This is perennial ryegrass bunches or clumps that have been adversely affected by the extreme swings in air temperature.
Earlier this March we exited the deep freeze and started seeing temperatures in the 70’s and more recently even low 80’s. Some grass types began coming out of dormancy, showing a nice green color and some even moderate top growth. We dipped back into the 20’s one or two days each week and even saw approximately 3” of snow cover.
Perennial ryegrasses, like tall fescue and fine fescues are “clump or bunch” growers by nature and are susceptible to freeze tip burn when they exit dormancy prematurely (encouraged by the early warm temperatures). Bluegrasses however hold a longer dormancy and generally do not begin their exit until sometime in April. The yellow circles are ryegrass clumps that have been frost burned but the damage is only temporary. As top growth continues and mowing begins, the yellow tips will be mowed off, and the entire grass plant will display its spring green color.
As a side note, we have also witnessed lots of yellow footprints both human and animal especially from deer. The foot traffic on a frozen lawn breaks the tender foliage of the grass plant and causes a similar look of freeze burn. Again, this is only a temporary situation alleviated by top growth and mowing.