Most cat owners run the same litter routine 365 days a year. But cats are sensitive to environmental changes, and so is the biology happening inside that litter box. Seasonal shifts — in temperature, humidity, and household activity — all affect how quickly odour builds up, how often you need to scoop, and what type of litter performs best.
Spring: The Deep Clean
Spring is the obvious time to do what you should do at least twice a year anyway: empty the box completely, scrub it down, and start fresh. Here's a step-by-step approach that takes about 20 minutes:
Start by moving the box to a well-ventilated area — outside if possible, or at least near an open window. Empty all used litter into a bag, seal it, and discard. Use warm water and a mild dish soap to scrub the interior, then hit it with a 50/50 white vinegar and water solution to neutralise any lingering bacteria. Let it air dry completely before adding new litter. While the box is empty, inspect it for cracks, discolouration, or any scratched surfaces that can harbour bacteria — if the box looks worn, replacing it is inexpensive and worth it.
Spring also brings increased airborne allergens. If you or your cat suffer at this time of year, switching to a low-dust or dust-free formula during spring months can make a noticeable difference. Look for explicitly labelled dust-free options — not just "low dust," which is an unregulated claim. Dust-free formulas are widely available on Amazon if your local pet shop has limited options.
Summer: Heat, Humidity, and Faster Breakdown
High temperatures accelerate everything in the litter box — urine breaks down into ammonia faster, solid waste starts smelling sooner, and bacteria multiply more quickly. In summer, you should be scooping at least twice a day rather than once. If you're home during the day, a third scoop in the afternoon can make a real difference.
Heat also affects clumping litter's performance. Some formulas become sticky or break down more quickly in high humidity, making the clump unreliable and harder to scoop cleanly. If you've noticed your litter performing differently in summer, it's not in your head — the humidity is affecting the sodium bentonite's reaction with moisture. Consider switching to a crystal litter during hot months, as silica gel is less sensitive to humidity swings and keeps odours locked away more reliably when temperatures rise.
Summer can mean more household activity — guests, open windows, air conditioning. Place your litter box away from any direct sunlight and from air vents that could push dry litter dust into living spaces. If you're running the AC constantly, the reduced humidity inside can actually help keep litter drier and fresher for longer — a small upside to climate control.
Autumn: Preparing for the Indoors
As cats spend more time indoors as the weather cools, their litter box usage increases. This is also when many households do a "closing up" of the house — windows shut, heating on, less ventilation. All of this accelerates odour concentration indoors.
Autumn is a good time to move to a more aggressive odour-control litter, or to add an activated carbon litter additive to your existing setup. It's also worth checking your box's placement — if it's in a corner that gets warm from central heating, you may be dealing with odour issues that aren't purely a litter problem.
Winter: Cold Weather Adjustments
Low temperatures have their own effects. In very cold environments, some litter types can freeze if the box is in an unheated space — which is a problem if your cat is outdoors and uses the box. Even indoor boxes can be affected: cold, dry air reduces the rate at which moisture evaporates, which means non-clumping litter can seem to last longer but may develop ammonia buildup beneath the surface layer.
Winter is also the season of dry indoor air. Heated spaces can desiccate clumping litter faster, making it less effective at trapping moisture. If your home runs very warm in winter, you may notice litter that's been sitting a while develops a stronger ammonia smell between scoops. Increase your scooping frequency even if the box doesn't look full — the smell will tell you when to act.
The One Constant
Across every season, the most effective maintenance tool isn't the litter type or the box design — it's consistency. Scoop daily at minimum. Full litter changes every 2-4 weeks depending on litter type and number of cats. Scrub the box at least twice a year regardless of what season falls on your calendar. The litter you choose matters, but only as much as the habit behind it.