Do i plant grass in the autumn

There are a few principals that will help you seed at the right time. First of all you want your newly seeded grass to be moist, something that's practically unachievable during summer. Second of all the heat helps the weeds grow and therefore once more you can see that summer isn't the greatest time to plant grass.

You should start planting at the end of summer. That way the temperatures won't be that high and it will be easier to keep the grass moist. Your main goal is that by winter time, the grass will be strong enough to survive the cold.

Small adjustments to the time of planting should be made in accordance with where you live and how fast winter sets in. 

May your grass always be green. 

I have found that the best time to plant grass seed is right after what is called by most Indian summer.  Usually late summer after the real hot weather.  make sure you rough up the ground then plant and water the seed well.  If you are living in an area where birds are abundant then you might benefit by using a thin layer of straw to protect your new grass seed from being eaten by the birds.   Good luck.  :)

September or February!

Great time to give it a shot. We did in our front yard and then covered with straw. Worked GREAT!

Hi,
It all depends what country you are.  If the winter is cold better give up and wait fot the spring.  If the winter is mild you can palnt grass.
Best regards,