On a cold Autumn evening...

[sondra]

Hello,

Could you tell me which sentence(it's actually not a sentence) is more correct?

'On a cold Autumn evening.'

'On a cold Autumn's evening.'

Thanks​

 

[Raymott]

Hello,

Could you tell me which sentence(it's actually not a sentence) is more correct?

'On a cold Autumn evening.'

'On a cold Autumn's evening.'

Thanks​

I much prefer the first.
If something isn't a sentence, you can call it a phrase, or a clause if it has a verb in it. This is a phrase.

 

[emsr2d2]

As with the other post in which you put the same phrase, you don't need a capital letter for "autumn".