Love Parks Week will take place between 25 July and 2 August 2009.
The new dates mean that the campaign will coincide with the summer holidays, enabling them to programme events that will attract more families and children to their local park.
This year's Love Parks Week took place from 14-22 June 2008. More than 250 events organised attracted 200,000 visitors.
The campaign aims to raise national and international awareness of the importance of Britain's parks and green spaces and the central role that parks play in communities across the country.
GreenSpace chief executive Paul Bramhill said: "Parks are an important resource for communities, especially in the current economic climate which is putting pressure on families' budgets for leisure activities.
"There aren't many other visitor attractions that are free to enter, open to all and that provide such a range of benefits to health, quality of life and the environment."
For more details email firstname.lastname@example.org, or call 0118 946 9066.