Karura Forest is 1,041 ha (2,570 acre) consisting of three parts separated by Limuru and Kiambu roads. The large middle portion is ca. 710 ha (1,750 acres); the Sigria salient to the west is ca. 250 ha (620 acres). The portion to the east of Kiambu road has been allocated to special national priorities. As of mid-2016, 36% of the forest contains indigenous upland forest tree species. The forest is home to some 200 species of bird as well as suni, Harveys Duiker, bushbucks, bush pigs, genets, civets, honey badgers, bush babies, porcupines, Syke's monkeys, bush squirrels, hares, fruit bats,and various reptiles and butterflies. Karura now has over 50 km of trails for visitors to walk, run or bike.
Wildlife in the forest include Monkey species (including recently re-introduced Colobus Monkeys), bush baby, bushbuck, bush pig, porcupine, duiker, genet, dik dik, African civet and East African epauletted fruit bat
Forest plantations cover some 630 ha. Species include imports from South America, Australia and the Asian sub-continent, such as Araucaria cunninghamii, Grevillea robusta, Eucalyptus saligna, E. globule, Cupressus torulosa and Cupressus lusitanica
The forest, as Nairobi, has two wet seasons: April to June and October to December. In July and August it is cool, cloudy and dry. From August to December it is sunny and dry. January, February and early March are hot and dry months.