Thermal & night vision for hogs

Thermal or digital night vision?

Thermal sees heat. A thermal scope or monocular reads the warmth a hog gives off and shows it against cooler ground, with no light needed at all. ATN puts it this way: a thermal scope "passively detects the heat energy that objects already radiate, which is why it works identically with or without any light present" (ATN). That makes thermal the tool for finding hogs you can't see yet, across a field or along a brush line, and for identifying them before you shoot. It costs more, and the budget models trade reach for a wide view.

Digital night vision is a camera sensor that needs light. On a dark night that light comes from an infrared illuminator, built in or clipped to the rifle, and the scope can only show what the beam reaches. The makers of the scopes we rank claim IR reach of about 200 to 380 yards. In return, night vision costs far less than thermal, most models double as day scopes, and it's well suited to a feeder at a distance you know. Our thermal vs night vision for hog hunting comparison works through the choice.

Sensor tiers: what 256, 384 and 640 buy at hog distances

Thermal sensors come in three common sizes: 256x192, 384x288 and 640x512. The number gets the attention, but the detail on a hog is set by two quieter specs, pixel pitch and lens focal length. Using the makers' published figures and a 5 ft hog, a 256 sensor with 12 µm pixels behind a 15 to 19 mm lens puts about 21 to 26 pixels across the hog at 100 yards. A 384 or 640 with 12 µm pixels behind a 35 mm lens puts about 49 there. What the bigger sensor buys is a wider view at the same detail: at 100 yards, that 35 mm lens shows about 39 feet of ground on a 384 and about 66 feet on a 640. That's illustrative math from published specs, and the best thermal scope for hog hunting ranking shows the working. For the full explainer, read 256 vs 384 vs 640 thermal.

In practice: a short-lens 256 is a feeder tool, fine inside about 100 yards. A 384 or 640 behind 35 to 50 mm covers feeder to open field. Digital zoom never adds pixels, so compare lens size and base magnification, not the top zoom number.

Scope or monocular first?

If you don't yet know where and when the hogs are coming in, a handheld thermal monocular is often the smarter first buy. It lets you scan the property and count a sounder without sweeping a rifle across animals, livestock or people you haven't identified. Our best thermal monocular for hunting ranks the scanners, and thermal monocular vs thermal scope helps you decide which to buy first. If you already own a good day scope, a clip-on thermal mounts in front of it and keeps your reticle. Several scanners and clip-ons work both ways.

The budget ladder

• Under $500: handheld thermal monoculars with 256 sensors, and digital night vision scopes with IR. We couldn't verify a thermal riflescope in this tier. See our best night vision scope for hog hunting.
• $500 to $1,000: 256 thermal scopes with 15 to 25 mm lenses, one 384 with a 35 mm lens, and 256 clip-ons. Ranked in the best thermal scopes under $1,000.
• $1,000 to $2,000: 384 scopes with 35 to 50 mm lenses, a 640, rangefinders and 9 to 10 hour batteries. The tier most hog hunters should aim for; see the best thermal scope under $2,000, and Pulsar Thermion vs ATN ThOR for its top two.
• $2,000 and up: rangefinders on 30 mm-tube scopes, dual-lens bodies, light 640s and premium clip-ons. More features than more detail.

For what each tier buys, and whether thermal is worth it for your problem, read how much a thermal scope costs. Once it's on the rifle, how to zero a thermal scope gets it shooting where it looks. Every pick on these pages is researched from published specs, not tested by us; how we choose explains the rubric.

A note on Texas law

On private property, TPWD sets no closed hunting hours for feral hogs and asks night hunters to give the local game warden a courtesy call (TPWD Outdoor Annual). Protected game, including deer, can't be hunted at night, so identify every animal before you shoot, and never hunt from a public road. The night rules are laid out, each one cited, in can you hunt hogs at night in Texas, and licensing, transport and the rest in Texas hog hunting laws.

Optics are one part of the plan

A good thermal takes hogs a few at a time. Texas A&M's Natural Resources Institute reports that removing about 66% of a population every year is needed just to stop it growing (Texas A&M NRI, 2019). That's why the optics here work best alongside trapping whole sounders. Start with how to get rid of feral hogs for the full system.