How much to water trees in the winter
It was an exceptionally wet fall here in Utah, but this winter, we’re experiencing significantly below-average precipitation, and while trees may appear dormant, they are still very much alive—and vulnerable.
When soils remain dry for extended periods, trees can suffer root dieback, increased pest and disease susceptibility, spring stress, and even delayed decline months later. Many of the tree failures we see in late spring and summer actually originate from winter moisture stress.
Why winter watering matters:
Snowpack normally insulates roots and provides slow, deep soil moisture.
This year, dry soils are not being recharged naturally.
Evergreen trees, newly planted trees, and mature legacy trees are especially at risk.
How much and how often to water:
As long as the ground is not frozen and daytime temperatures are above 40°F, we strongly recommend supplemental watering.
For established mature trees, 10–15 gallons per inch of trunk diameter. Apply once every 3–4 weeks during dry winter periods.
For younger or recently planted trees (last 1–3 years), 5–10 gallons per inch of trunk diameter. Apply every 2–3 weeks.
For evergreen trees, we recommend more consistent moisture with similar volumes to those above, but without skipping cycles.
Best practices:
Water slowly so moisture penetrates 12–18 inches deep.
Apply water at the drip line, not directly at the trunk.
Avoid watering when soil is frozen or temperatures are below freezing for extended periods.
Mulch (2–4”) helps retain soil moisture and protect roots
A proactive approach pays off.
Supplemental winter watering is one of the most effective and least expensive ways to protect your trees’ long-term health. Trees that enter spring well-hydrated leaf out stronger, resist pests better, and require fewer corrective interventions later in the year.
If you’re unsure whether your trees are receiving adequate moisture—or would like help setting up a winter watering plan—we’re happy to help.
