If you want to restore any bare patches, or are even thinking of sowing a completely new lawn, early autumn is a good time to do it.
But how do you choose the type of seed for the job from the array of different grass seeds on the market? Help is at hand from Which? Gardening, the Consumers' Association magazine, which has just revealed the results of its test on 36 lawn seed mixes and repair kits, assessing germination and appearance of the grass and coverage of each plot at monthly intervals.
Best overall lawn seed mix is Asda Multipurpose (£3 for 500g), which the survey says will give a great looking lawn.
In the trial, it established quickly, gave a dense, finer-leaded turf, was among the best for coverage and appearance and recovered well after wear-and-tear tests.
The next highest scorer was Mr Fothergill's Better Lawn (£5.99 for 500g, available from garden centres), which looked good throughout the autumn and following spring.
It also recovered quickly after the wear-and-tear tests and had produced a dense sward by the end of the trial.
For those just repairing their lawn, the researchers recommend Miracle-Gro Patch Magic (£9.99 for 1kg, Tesco), which worked exceptionally well in the trial and established quickly.
If you are sowing a new lawn, you will need to dig over the area thoroughly to allow free drainage, removing stones and weeds as you go, then incorporate organic matter, such as compost or well-rotted manure.
On heavy clay incorporate sharp grit and organic soil conditioner. On light soils just put in the organic matter.
Firm the ground by laying a plank of wood on it and walking over it several times. Then move the plank across the site until the whole area is firmed, but not compacted.
Next rake the area to produce a fine 'tilth' on which to sow the seed. You may need to rake repeatedly until the ground is level and the surface is crumbly.
Choose the grass seed to suit your needs. A lawn for a family-friendly garden may include a mixture of dwarf perennial ryegrasses to withstand heavy use, while a lawn just to look upon might be a mixture of fine tufted grasses.
Always follow the instructions on the packet about seed distribution and do not be tempted to sow more thickly than recommended.