A study was carried out to establish the performance of pastures in farmers’ fields that had been sown during the long rains of 2009. The purpose of the on-farm trials was to ascertain that the specific grass species selected by farmers would establish in their respective farms and was intended for seed production to be used in natural pasture improvement in response to scarcity of such seed in the market. Plot size, aspect, and method of establishment varied between farms, going by farmers’ own practices. The study which was part of routine monitoring of ongoing field activities under Community Based Range Forage Seed System Project under KASAL was done in Kibwezi and Kathonzweni districts. It was found that the mean density for sown grasses during 2 different monitoring sessions ranged from 0.0-125.8, 0.0-11.0 and 0.0-22.5 plants/m2 for Enteropogon macrostachyus, Cenchrus ciliaris and Eragrostis superba, respectively. Bare ground was significantly higher than plant cover in all farmer fields except in one of the fields during the first monitoring (M1). The average ground cover was 45.8% after one year of establishment indicating a high percentage of bare patches. There was no significant difference (p> 0.05) in total percent cover between M1 and M2 in each farmer field. The low performance of the planted grasses could be due to severe drought during the 2009 year of establishment. There is need for repeat sowing with the same grass species in the same fields to hasten establishment and increase per unit land productivity in terms of forage and seed production.