January Lawn Care in Corona, CA: Fertilizer and Mowing Timing

A new homeowner in Corona, California wants to know whether to fertilize an established sod lawn in January and whether weekly mowing helps when growth is slow.

Fertilizer: Wait. Cool temperatures mean minimal growth. Applying nitrogen now is inefficient—grass can't use it, and it may leach or feed weeds. Hold off until daytime highs are steadily above 75°F. Then, a quality organic fertilizer (Milorganite is a favorite) supports steady, sustainable growth.

Mowing: Mowing doesn't stimulate growth in cold weather. Only mow when the grass actually needs it—typically when it reaches about 1/3 above your target height. In winter, that might mean every 2–3 weeks or less. Keep blades sharp; dull blades tear dormant grass, increasing stress and disease risk.

Pro tip: Use the winter downtime to sharpen mower blades, service equipment, and plan a soil test for early spring. A little prep now makes the growing season smoother.