The Best Time of Year to Buy a Robot Lawn Mower

Robot mowers are one of the most seasonal purchases there is. That works in your favor if you buy when nobody else is, and against you if you wait until the grass is already ankle-high in April.

There’s a real trade-off here, and it isn’t the one most buying guides describe. The cheapest moment and the safest moment aren’t the same.

The trade-off nobody mentions

Buy in November and you may get the best price of the year. You also can’t test the mower properly, because the grass isn’t growing and the ground may be frozen. By the time you find out that your tree cover breaks its satellite navigation, or that it can’t get through your side gate, the return window closed months ago.

Buy in late summer and the discounts are shallower, but you can map the lawn, run it for a fortnight and send it back if it doesn’t suit your yard. For a purchase this size, that’s worth a lot.

Month by month

Southern readers: a long warm-season growing period shifts this later. If your grass is still growing in November, you get the best of both.

Why spring is the worst time

Three reasons, and they compound:

• Everyone buys then. Demand is concentrated in spring and summer, so retailers have no reason to discount.
• Popular models sell out. You end up choosing from what’s in stock rather than what fits your yard, which is exactly the wrong way round.
• You’re rushed. Nothing encourages a bad purchase like a lawn that needs cutting this weekend.

If you’re reading this in April with long grass, the answer isn’t to panic-buy. Cut it yourself for a few weeks and choose properly.

What model-year turnover means for you

Manufacturers announce new mowers ahead of the spring season, which makes late fall and winter the point where outgoing models get cleared. That’s usually a genuine bargain rather than a compromise: the current generation of robot mowers is very capable, and one model year rarely changes much.

The exception is buying something genuinely old. Independent reviewers describe earlier mowers as held back by boundary wires, poor slope handling and getting stuck, compared with current models using laser scanning, cameras and all-wheel drive. A steep discount on a design from that earlier era isn’t the same as a discount on last season’s flagship.

Whenever you buy, do this first

Timing only helps if you already know what you’re looking for. Before any sale event, get these four numbers:

1. Your measured grass area, not your lot size.
2. Your steepest slope, as a percent grade.
3. Your tree cover, which decides the navigation type you need.
4. Your narrowest passage, in inches.

With those written down, any deal becomes a yes or no rather than a maybe.

A note on buying to test late in the season

If you buy in August or September specifically so you can test the mower, use the time properly. Map the lawn, run it for a couple of weeks, and check the things that are hard to judge from a spec sheet: whether it gets through your gate, whether it holds position under your trees, whether you can lift it comfortably, and whether the app makes sense to you.

Then, when the season ends, put it away properly. Our winter storage guide covers that.

Questions

When are robot lawn mowers cheapest?

Generally late November, around Black Friday on November 27, 2026, and through winter clearance. The trade-off is that you can’t test a mower on a dormant lawn, so check the return window before buying that far out of season.

Should I wait until spring to buy?

No. Spring is peak demand, which means the weakest discounts and the thinnest stock of popular models. If you’re buying in spring anyway, choose the mower on fit rather than on what happens to be available.

Is it worth buying last year’s model?

Usually yes. Model years rarely change much, and outgoing stock gets cleared ahead of spring launches. What’s worth avoiding is a genuinely older design, particularly one no independent outlet has tested, since the technology moved considerably over several years.