"Les gelées du matin ne sont pas rares."

Translation: Morning frost is not rare.

[SMCG9]

I see no reason not to allow "frosts". The french is plural and the english can be too

[n6zs]

Fixed. It may take a few days for the system to catch up to the correction.

[mng22]

Still not accepted Sept. 4, 2018. Reported.

[NezihD]

Still not accepted Jan. 27, 2019. Reported.

[lukyuri]

Still not accepted Jan 30 2019

[RuthZ1..]

It would seem reasonable to accept either and teach both, as Duo does with some other expressions. By the time someone gets to this stage of the course they will have noticed that Duo has this approach, and, hopefully, be able to benefit from it.

[Robo2801]

The subject is 'Morning Frosts' (plural)
The verb is 'are' (plural)
The answer could also be 'Morning frosts are not rare'
But Duolingo is free and that's amazing!

[MarkHolden8]

Why not "frosty mornings are not rare"

[Johan_Jannasch_1]

Because in my limited understanding, "du" means "of the" so it literally translates to "frost of the morning" the focus is on the frost and not the mornings, but like I said limited understanding, just trying to explain how I understand

[ian116730]

Although wrong I prefer it mark

[Stonnington]

Frosts in the morning are not rare. Wrong May 2019

[Lizzie898860]

The pronunciation of rare was impossible to decipher. The female voice is much better. I think the guy is from the south!