Setting Up Your First Trail Camera Grid
Most people start with one trail camera on the most obvious game trail they can find, and that's a perfectly reasonable way to confirm that something is passing through. But a single camera only ever samples one narrow slice of an area, and it will systematically miss any animal whose home range or daily movement doesn't happen to cross that exact spot. A grid — multiple cameras spaced deliberately across a survey area — is what turns "I saw a deer once" into an actual picture of what's using the land.
The core idea: spacing to home range
Camera-trap survey design in wildlife research generally sizes camera spacing to the home range of the target species, on the logic that you want a reasonable chance of at least one camera falling inside any given resident animal's territory. Picture laying cameras out on a grid: if each camera effectively "covers" a square cell, setting that cell's side length to roughly the square root of the animal's typical home range area means most individual home ranges will contain close to one camera — tight enough for reliable detection, without wastefully over-spacing cameras closer than the science actually calls for.
Our Trail Camera Spacing Calculator does exactly this calculation, either from a species preset or a home-range figure you supply, and returns a recommended grid spacing in both kilometres and metres.
Why spacing varies so much by species
Home range size scales with body size, diet, and social structure, and the differences are large. A raccoon's home range often runs under a couple of square kilometres, calling for relatively tight camera spacing to reliably detect it. A coyote's home range is commonly in the 10–20 square kilometre range, and a male black bear's can run into the tens of square kilometres, both calling for much wider spacing. If you're surveying for several species at once — which is normal, since a camera doesn't know what it's supposed to photograph — plan your grid around the smallest home range among your target species, since that's the one most likely to be missed by wide spacing.
Placement still matters within the grid
Grid spacing tells you roughly where each camera should sit; it doesn't excuse ignoring the terrain once you're there. Within each grid cell, look for a natural travel corridor — a trail, a saddle between two ridges, a stream crossing, a fence gap — since animals concentrate their movement along these features far more than the raw grid math assumes. Mount the camera at roughly the height and angle appropriate for your target species (commonly 30–45 cm off the ground, angled slightly downward and perpendicular to the expected direction of travel) so a passing animal spends more time inside the trigger zone.
Adjust for what you're actually trying to learn
Not every project needs the same rigor. If your goal is simply confirming presence — "is anything using this property at all?" — the raw home-range spacing is a fine starting point. If your goal is closer to a scientific survey, estimating density or trying to identify most of the resident individuals of a species, you'll generally want tighter spacing than the basic calculation suggests, along with a longer deployment period and more attention to detection probability. A backyard curiosity project and a formal population survey are different enough in rigor that it's worth being honest with yourself about which one you're actually running before you commit to a spacing number.
Getting started
Pick your target species (or the smallest home range among several), run the spacing calculator, sketch a rough grid over a map of your survey area, and adjust each point to the nearest genuinely promising terrain feature nearby. Log the date, coordinates, and setup notes for each camera in a field notebook so that when you review the footage weeks later, you can tie every photo back to exactly where and how that camera was set.