You’re out in the yard and something catches your eye: a mound of loose dirt at the base of the fence, or a rodent that darts across the lawn and disappears into a hole in the ground instead of scrambling up the nearest tree. By the time you look again, it’s gone. That kind of sighting is a classic sign of a ground squirrel in California, and it rarely means just one. Where there’s a single burrow, there’s usually a colony nearby.
This guide walks through how to tell a ground squirrel apart from a tree squirrel, what burrow and plant damage actually looks like, the health risks tied to their fleas, and when it’s worth bringing in a pest professional to evaluate the problem.
Key Takeaways
- Ground squirrels always dive into a burrow when startled, while tree squirrels climb trees instead, which is the fastest way to tell the two apart.
- Burrow openings, chewed irrigation lines, and girdled young trees are usually the first visible signs of damage before a colony grows larger.
- Their burrowing can undermine structures and their fleas can carry disease, which is why unusual squirrel die-offs should be reported rather than handled directly.
- California law allows property owners to control ground squirrels damaging their land without a permit, but timing and method matter enough that many homeowners bring in a professional to confirm the right approach.
How to Identify a Ground Squirrel in California
Ground squirrels are easy to spot once you know their habits. They forage above ground near their burrows and are active during the day, mainly from mid-morning through late afternoon on warm, sunny days.
Adults measure 14 to 20 inches, including the tail, and weigh between 21 and 30 ounces. Their fur is mottled brown with gray and white markings, and a distinctive white ring circles each eye. The tail is bushy, though noticeably less so than a tree squirrel’s.
Ground Squirrels vs. Tree Squirrels
The two look similar enough to confuse, but their behavior gives them away. Underground burrow systems are where ground squirrels sleep, raise young, and store food, while tree squirrels build nests above ground and never use burrows. When startled, ground squirrels retreat to a burrow, while tree squirrels climb a tree or another tall structure instead. That single behavior is the most reliable way to tell the two apart in the yard.
Signs of Burrow Activity
Burrow entrances run about 4 inches in diameter, and burrow systems typically stretch 5 to 30 feet long, usually within a few feet of the surface. A single opening can house one squirrel, or a whole colony. Look for scattered soil fanned out around the entrance, worn paths leading to and from it, and multiple openings connected underground. Squirrels tend to dig along fence lines, foundations, ditches, and other open, uncultivated ground where they have a clear line of sight to spot predators.
Where Ground Squirrel Damage Shows Up
What makes a yard attractive to them comes down to visibility. They prefer open, grassy terrain with clear sightlines, and lawns, embankments, and cleared lots across California can end up hosting a colony once squirrels move in. Once a colony settles into a site, it tends to reinvade and expand rather than move on, which is why small infestations are worth addressing before they grow larger.
Plant and Landscape Damage
Food-bearing and ornamental plants take the brunt of it, especially nut and fruit trees such as almond, apple, apricot, orange, peach, and walnut. In home gardens, they’ll eat vegetable seedlings, gnaw bark, girdle young trunks, and chew through irrigation lines and plastic sprinkler heads.
Structural and Yard Damage
Burrowing is the most disruptive part of a ground squirrel problem. Burrows and mounds make mowing difficult and create hazards for pedestrians, pets, and machinery, and burrowing near structures can require costly repairs. Roots near burrow systems can dry out, which in some cases is enough to topple a tree.
Health Considerations
Disease is a real concern too. Bubonic plague is the main one, and it spreads to people through fleas that live on the squirrels. Those same fleas can spread the disease and wipe out colonies of squirrels as well.
In California, ground squirrels are a documented source of plague activity in foothill and mountain regions. If you notice several dead squirrels or other rodents with no obvious cause, report it to state health officials rather than handling the animals directly.
If you’re already seeing chewed irrigation lines, girdled trees, or burrow openings near your foundation, Official Pest Prevention can inspect your property, assess the damage, and recommend the most appropriate next steps.
Preventing and Managing Ground Squirrels
Once you’ve confirmed ground squirrels are the source of the problem, the next question is what to do about it. California law classifies them as nongame mammals that owners can control without a license when they’re damaging property, but a mix of habitat changes and correctly timed removal is what actually reduces a colony, and getting either one wrong is a common reason DIY efforts fall short.
Habitat Changes That Discourage Squirrels
A prevention-first approach makes a property less appealing to ground squirrels in the first place. Clearing brush piles and debris removes the cover they use during retreat, and keeping vegetation from growing too dense limits the open sightlines that drew them in to begin with.
Timing Matters for Removal Methods
Burrow treatment works best in late winter and spring, when the soil holds moisture, while trapping is more effective through the warmer months when squirrels are actively foraging. Getting the timing, method, and site conditions right on your own can be difficult. If you’re unsure which approach is best for your property, Official Pest Prevention can inspect your property and recommend the most appropriate next steps based on what they find.
Ground Squirrels in California: Bottom Line
A single burrow is rarely the whole story. It’s usually the visible edge of a larger colony, and the plant loss, chewed lines, and foundation wear already covered in this guide get worse the longer a colony goes unaddressed. Identifying a burrow early and knowing when a DIY approach has reached its limit are what keep a small problem from turning into a bigger, costlier one.
Official Pest Prevention has served homes and businesses across Northern and Central California, including areas from Fresno to Elk Grove and communities throughout the Central Valley, since 2000, with every service backed by a 100% satisfaction guarantee. If recurring burrows or property damage have become a concern, contact Official Pest Prevention to schedule an inspection and learn about the most appropriate next steps for your property.
Frequently Asked Questions
How can I tell if I have ground squirrels instead of tree squirrels?
Watch what the animal does when startled. Ground squirrels always retreat into a burrow, while tree squirrels climb a tree or structure and never use one. Ground squirrels also have a white ring around each eye and a tail that’s noticeably less bushy than a tree squirrel’s.
Are ground squirrels dangerous to have around my home?
They can pose a health risk. Ground squirrels are known to carry fleas linked to bubonic plague, particularly when populations grow large. Beyond health concerns, their burrowing can damage irrigation lines, landscaping, and even building foundations over time.
Can I remove ground squirrels myself?
California law allows property owners to control ground squirrels that are damaging their property without a license, but the right method depends on the season, colony size, and site conditions. A licensed pest control company can identify the species correctly and apply the most effective approach for the time of year.
What time of year are ground squirrels most active?
They’re active during the day, mainly from mid-morning through late afternoon on warm, sunny days. Activity slows during winter hibernation and again during hot summer stretches, when adults go through a period of inactivity called estivation.
When should I call a pest control professional about ground squirrels?
If burrows continue appearing, damage is increasing, or you’re unsure which animal is responsible, scheduling an inspection can help identify the source of the problem and determine the most appropriate next steps.
