Denver Tree Watering Restrictions: How to Protect Trees During Drought

 

Denver homeowners are facing a unique challenge this fall: conserving water while keeping their trees healthy during ongoing drought conditions.

Beginning October 1, 2026, Denver Water has prohibited lawn watering and spray irrigation, but trees and shrubs can still be watered by hand or with low-volume, non-spray irrigation such as drip systems. (Denver Water)

This means homeowners should continue paying attention to their trees even after shutting down their lawn sprinklers.

Do Trees Still Need Water in the Fall?

Yes. Cooler temperatures do not necessarily mean trees have enough moisture.

Colorado’s dry climate, low humidity, and occasional windy conditions can continue to dry out soil during the fall and winter. Trees that experience prolonged drought stress may have difficulty maintaining healthy growth and defending themselves against other stresses.

Newly planted and young trees generally need especially close attention because their root systems are still developing.

Even mature trees can experience drought stress, particularly when they are growing near pavement, in compacted soil, or in areas with limited available moisture.

 

How Can You Water Trees During Denver’s Restrictions?

Although lawn watering and spray irrigation are restricted, Denver Water allows homeowners to provide water to trees and shrubs using certain methods.

 

Hand-Watering

A garden hose with an automatic shutoff nozzle can be used to water trees. Apply water slowly around the tree’s root zone rather than concentrating it directly at the trunk.

 

Drip or Low-Volume Irrigation

Drip irrigation and other low-volume, non-spray systems can provide water directly to the soil while reducing evaporation.

 

Water the Root Zone

Tree roots can extend well beyond the trunk. Instead of watering only at the base, spread water throughout the area beneath and around the tree’s canopy.

The goal is to moisten the soil without creating standing water or runoff.

 

When Should You Water?

Denver Water recommends avoiding outdoor watering between 10 a.m. and 6 p.m. to reduce water lost through evaporation. Early morning or evening can be better times to water.

Pay attention to weather conditions and soil moisture rather than following a rigid schedule. If the soil is already adequately moist, additional watering may not be necessary.

Because watering rules can change with drought conditions, homeowners should check the Denver Water website for the most current requirements.

 

What Are Signs of Drought Stress?

Drought stress is not always immediately obvious. Watch your trees for:

• Wilting or drooping leaves
• Brown or scorched leaf edges
• Premature leaf drop
• Thinning foliage
• Reduced new growth
• Dead branches
• Dry or cracked soil around the root zone

These symptoms can also have other causes, including insects, disease, root problems, or soil conditions. If you notice significant or unusual changes, an arborist can help determine what is affecting the tree.

 

Can Mulch Help Protect Your Trees?

Yes. Properly applied mulch can help conserve moisture and protect the soil around a tree’s roots.

Apply a layer of organic mulch around the root zone, but keep mulch away from the trunk. Avoid creating a thick mound against the bark, sometimes called a “mulch volcano.”

A properly maintained mulch ring can help reduce evaporation and competition from grass and weeds.

 

Don’t Forget About Winter Watering

Colorado’s winter weather can be deceptive. Snow does not always provide enough moisture for trees, particularly during extended dry periods.

Denver Water recommends supplemental winter watering during dry conditions when temperatures are above 40°F and the ground is not covered by snow.

Winter watering should be done carefully and only when conditions are appropriate.

 

When Should You Call an Arborist?

If your tree is showing significant signs of drought stress, a professional evaluation can help identify the cause.

An arborist can look at the tree’s canopy, branches, trunk, root zone, soil, and surrounding conditions to determine whether drought, insects, disease, or another issue may be affecting its health.

Consider having a tree evaluated if you notice:

• Significant canopy thinning
• Large dead branches
• Sudden or severe leaf loss
• Trunk or bark damage
• Repeated drought stress
• Signs of insects or disease

 

Protect Your Denver Trees During Drought

Denver’s 2026 watering restrictions are designed to conserve water, but homeowners can still take steps to protect their trees.

By watering appropriately, maintaining the root zone, using mulch, and watching for signs of stress, you can help your trees stay healthier through dry conditions.

If you’re concerned about a tree on your property, Donovan Arborists can evaluate its health and help identify appropriate care for Colorado’s climate.

Call us today at (720) 689-7753 or use our FREE ESTIMATE form – We look forward to hearing from you!