Abstract: Compost and vermicompost are organic fertilizers known for improving soil properties and agricultural productivity but little is known about their application timing for optimum efficacy on plant productivity particularly on maize growth. A field experiment was conducted to evaluate the effect of compost and vermicompost from poultry waste and their application timing on maize growth and yield attributes under randomized complete block design with three replicates during three season-cycles. Results showed that the seeds germination was not influenced by the organic fertilizers. The highest number of leaves under the ear, the highest insertion height of ears was respectively 5.65 and 66.2 cm with the vermicompost spread before sowing, and 5.45 and 84.25 cm with the compost before sowing. The tallest plant was obtained with the compost (178.95 cm) applied before sowing. The longest leaves (74.98 cm) were measured when the vermicompost was spread before sowing. The longest ear (15.55±4.15 cm) was got with the compost applied before sowing. The highest number of rows of grains per ear (15), the maximum number of grains per row (18) and the highest weigh of 100 grains (15.11 g) were obtained with the compost and the vermicompost applied before sowing. Thus, compost and vermicompost from poultry waste can be used to increase maize productivity when they are spread before sowing.