Texas Freeze Protection for Landscaping: How to Safeguard Plants, Pipes, and Irrigation

If you lived in North Texas during February 2021, you remember. The winter storm that brought sub-freezing temperatures for over a week, knocked out power for millions, and devastated landscapes across the region. The 2021 winter storm was a wake-up call for DFW homeowners. It showed us that “it never gets that cold here” is a dangerous assumption. At Groundhogs Services, we helped hundreds of Mesquite, Dallas, and North Texas homeowners assess and recover from that storm. Here’s what we learned — and how to protect your landscape before the next big freeze.

Understanding Freeze Risk in DFW

North Texas is in USDA hardiness zone 8a, which means average minimum temperatures of 10-15°F. But averages can be misleading. We’ve seen:

• **Typical winter:** 20-30 freezes, with 2-3 hard freezes below 28°F
• **Cold snaps:** Occasional drops to 10-15°F lasting 1-2 days
• **Extreme events (like 2021):** Multiple days below 10°F, with wind chills well below zero

The difference between a typical freeze and an extreme event is preparation. For a typical freeze, covering tender plants is enough. For an extreme event, you need a comprehensive plan.

Pre-Freeze Watering: Your First Line of Defense

Watering before a freeze is one of the most effective — and most overlooked — protection strategies. Here’s why it works:

• **Wet soil holds more heat** than dry soil. Water releases heat slowly as it freezes, keeping soil temperatures 2-5°F warmer.
• **Well-hydrated plants** are more cold-tolerant than stressed, dry plants.
• **Deep soil moisture** protects roots even if top growth is damaged.

How to Water Before a Freeze

1. **Water 24-48 hours before** the freeze is forecast to arrive
2. **Water deeply** — saturate the root zone to 12-18 inches
3. **Water during the warm part of the day** — typically late morning to early afternoon
4. **Don’t water if the ground is already frozen** — it will just run off

Important: Stop watering before temperatures drop below freezing. You don’t want ice forming on leaves and branches.

Covering Methods: What Works and What Doesn't

Best Options

Frost cloth — The gold standard. Lightweight, breathable polypropylene fabric that traps ground heat while allowing air circulation. Available in different weights for different freeze severity. Can be left in place for multiple days.

• **How to use:** Drape directly over plants or use stakes to create an air gap. Secure edges with rocks, bricks, or landscape staples.
• **Temperature range:** Provides 4-8°F of protection depending on weight
• **Where to buy:** Garden centers, hardware stores, online

Burlap — Natural fiber that provides good insulation. Best for wrapping shrubs and small trees. Allows air circulation while blocking wind.

• **How to use:** Wrap around the plant and secure with twine. For trees, wrap the trunk and main branches.
• **Temperature range:** 3-6°F of protection
• **Best for:** Evergreen shrubs, young trees, roses

Old sheets and blankets — Work in a pinch but have limitations. They can absorb moisture and become heavy, potentially damaging branches.

• **How to use:** Drape over plants using stakes to keep fabric off foliage. Remove during the day to prevent overheating.
• **Temperature range:** 3-5°F of protection
• **Caution:** Do NOT use plastic sheeting. It traps moisture, creates condensation, and can freeze against the plant, causing more damage than the cold itself.

What NOT to Use

• **Plastic sheeting/tarps** — Traps moisture, causes condensation, and transfers cold directly to plants
• **Newspaper** — Provides minimal insulation and disintegrates when wet
• **Leaves piled on plants** — Can trap moisture and cause rot

Irrigation Blowout: Protecting Your System

A frozen irrigation system can cost thousands to repair. Burst pipes, cracked valves, and damaged backflow preventers are common after hard freezes. Here’s how to protect yours.

Professional Blowout

The most thorough method is a professional irrigation blowout using a high-volume air compressor. A professional will:

1. **Shut off the water supply** at the main valve
2. **Open the drain valves** at the lowest points in the system
3. **Connect an air compressor** to the system
4. **Blow out each zone** individually, starting with the zone farthest from the compressor
5. **Continue until only mist** comes from the sprinkler heads
6. **Insulate the backflow preventer** with foam insulation

When to do it: In DFW, schedule your blowout between Thanksgiving and mid-December, before the first hard freeze.

DIY Drain Method

If you can’t get a professional blowout, at minimum:

1. **Shut off the water** at the main valve
2. **Open all manual drain valves** — these are typically at low points in the system
3. **Run each zone for 30-60 seconds** with the water off to release remaining pressure
4. **Remove and drain the backflow preventer** if possible
5. **Wrap the backflow preventer** with foam insulation and plastic

Warning: The DIY method is not as effective as a professional blowout. In a hard freeze (below 20°F), you may still get damage.

Pipe Insulation for Exposed Plumbing

Any exposed water pipes — hose bibs, irrigation valves, outdoor faucets — need protection.

• **Frost-proof hose bibs** — Install these if you don’t have them. They shut off water inside the heated part of the house.
• **Faucet covers** — Foam covers for outdoor faucets are cheap and effective. Available at any hardware store.
• **Pipe insulation** — Foam pipe insulation for exposed pipes. Use the thickest available.
• **Heat tape** — For extremely vulnerable pipes, electric heat tape provides active protection.

Plant Selection for Freeze Zones

The best freeze protection is choosing plants that don’t need it. Here are plants that survived the 2021 winter storm with minimal damage:

Trees That Survived 2021

• Live oak — Minimal damage
• Cedar elm — Excellent cold tolerance
• Chinquapin oak — No damage observed
• Texas red oak — Good cold tolerance
• Bur oak — Native and extremely cold-hardy
• Pecan — Some branch damage but recovered

Shrubs That Survived 2021

• Texas sage (Leucophyllum frutescens) — Some tip damage but recovered
• Dwarf yaupon holly — Excellent cold tolerance
• Wax myrtle — Minimal damage
• Agarita (Mahonia trifoliolata) — Native and bulletproof
• Flameleaf sumac — Native and extremely hardy

Plants That Struggled in 2021

• Citrus — Most died without protection
• Bougainvillea — Killed to the ground
• Hibiscus — Killed to the ground
• Lantana — Killed to the ground (but many returned from roots)
• Mexican fan palm — Most were killed
• Sago palm — Most were killed or severely damaged

Post-Freeze Assessment

After a freeze, it’s tempting to start cutting off damaged material. Don’t. Here’s the right approach:

Immediate (First 24-48 Hours)

1. **Remove covers** during the day if temperatures rise above freezing
2. **Don’t prune anything** — damaged tissue may still protect the plant
3. **Don’t fertilize** — it can burn stressed plants
4. **Water if the ground is thawed** — hydration helps recovery

Short-Term (1-2 Weeks)

1. **Assess damage** — Wait for new growth to appear. What looks dead may recover.
2. **Scratch test** — Scratch the bark on branches. Green = alive. Brown = dead.
3. **Prune dead material** — Once you’re sure it’s dead, prune back to live tissue
4. **Be patient** — Some plants take weeks to show signs of life

Long-Term (Spring)

1. **Replace dead plants** — Choose hardier varieties this time
2. **Fertilize lightly** — Once new growth appears
3. **Monitor for pests** — Stressed plants attract pests

Lessons from the 2021 Winter Storm

The February 2021 storm taught us several hard lessons:

1. **Prepare for the worst** — Even if it only happens once a decade, have a plan for extended sub-freezing temperatures
2. **Multiple layers help** — Plants covered with frost cloth AND a blanket survived better than those with single coverage
3. **Location matters** — Plants near the house (radiant heat) survived better than exposed plants
4. **Native plants recover** — Almost all native Texas plants survived, even if they looked dead initially
5. **Irrigation is vulnerable** — Thousands of DFW homeowners needed irrigation repairs after 2021

Ready to Protect Your Landscape?

Freeze protection is an investment in your landscape’s future. A few hours of preparation can save thousands in damage. Whether you need irrigation blowout, plant protection, or a full landscape freeze plan, Groundhogs Services is ready to help.

Call us at (214) 713-1228 or visit groundhogstx.com to schedule your freeze protection service. We serve Mesquite, Dallas, Garland, Rockwall, and all of North Texas. Don’t wait until the forecast says freeze — prepare now.