Have you noticed pale, straw-colored lines on your lawn after mowing, foot traffic, or using equipment like fertilizer spreaders or vehicles? You’re likely witnessing Heat Tracking—also known as tire bruising, tip burn, or footpath stress. This common summer lawn issue happens when grass blades are damaged by compression during hot, dry conditions.

What Is Heat Tracking?

• What It Looks Like: Sharp, razor‑thin lines or tracks that align with mower tires, footpaths, wheels, or other repetitive traffic patterns.
• What Causes It:
  • Turgor Loss: In heat and drought, grass loses internal water pressure (turgor), making blades brittle.
  • Mechanical Compression: Weight from mower tires, fertilizer spreaders, cars, footsteps, or bikes crushes fragile grass blades and ruptures cell walls and chloroplasts.
  • Thermal Spike & Bleaching: Damaged tissue overheats, dries out, and turns tan within 24–48 hours.
• Traveling Agents: Not just mower tires—a range of activities can cause heat tracking:
  • Footsteps and footpaths
  • Wheels from fertilizer spreaders, bicycles, lawn rollers
  • Vehicle tires parked or driven on heat‑stressed grass

How to Identify Heat Tracking vs Other Damage

• Sharp and linear damage: Tire‑width stripes or footpath lines indicate physical damage—not a chemical burn.
• Roots remain healthy: Gently tug a straw‑colored blade—if the root is firm and white it’s heat tracking. Chemical burns typically produce brittle brown or black roots.
• Timing: Occurs when turf hits the wilting point during prolonged high‑temperature/low‑moisture periods. Cool nights and rainfall aid recovery.

Why This Isn’t a Chemical Burn

Chemical burns tend to be blotchy or broad, often covering boom-width swaths, and damage crowns and roots. In contrast, heat tracking results in clean lines, leaves crowns intact, and does not require reseeding if the turf was healthy to begin with.

How to Prevent Tire Bruising (Heat Tracking)

Water Wisely

• Irrigate deeply to soak the root zone. Keeps blades turgid and less susceptible to damage.
• Monitor for early wilt—watering before signs appear is more effective.

Modify Traffic and Timing

• Avoid mowing or equipment traffic during the hottest hours—prefer early morning or evening when grass is cool.
• Limit foot traffic and equipment movements when grass is wilted or stressed.

Equipment and Height Adjustments

• Reduce tire pressure on mowers and spreaders to distribute weight more gently.
• Raise mower deck height (3½–4″) to reduce impact and preserve soil moisture.

How to Recover from Heat Tracking

• Be Patient: Cool weather and regular irrigation usually bring the lawn back in 1–3 weeks for cool-season grasses.
• Aeration Helps: Lightly aerate bruised areas to relieve compaction and encourage new rooting.
• Deep, Frequent Watering: Supports recovery and encourages new blade growth.
• Reseed if Needed: Only in severely thin or stressed areas—healthy crowns usually regenerate fine on their own.

Quick Reference: Heat Tracking Summary

Final Thoughts

Heat tracking—whether from mower tires, fertilizing machines, cars, bicycles, or repeated foot traffic—is a non‑permanent stress injury caused by mechanical pressure on weakened grass in heat conditions. It looks alarming but is not fatal. With proper watering, traffic management, and patience, your lawn can bounce back beautifully.

At My Fertilizing Company, we’re here to help diagnose your lawn condition and tailor care plans to your turf type and conditions. Contact us any time for expert assistance in keeping your yard lush, green, and resilient.