The suspected World War II device was destroyed by bomb disposal teams.
The incident happened after the grenade was found near Arno Vale Road in Woodthorpe at 7:25 pm on 24 April.
The device was detonated at Gedling Country Park.
Nottinghamshire Police said:
“The grenade, which appeared to be from the Second World War era, was found in Arno Vale Road, Woodthorpe.
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“Police cordons were temporarily put in place on the road, while joint services explosive ordnance disposal engineers safely removed the object.
“Bomb disposal experts then carried out a successful controlled explosion soon afterwards. No evacuations were necessary due to the rural location.”
