This paper compares the biogas ignition time from 8 kg cattle dung, 4 kg each of cattle dung and cassava peels, and 4 kg cattle dung with 4 kg plantain peels. Digesters with 1 m diameter, 0.75 m height and 2 mm thickness made of mild steel were used for the anaerobic digestion of the three substrates in a mesophilic environment. The substrate was charged to the digester after thorough mixing with water at 1:2 by mass. The biogases were daily tested for combustion. Temperatures and pressures of the digesters were monitored at 10 am and 4 pm daily with mercury thermometers and pressure gauges installed on them. The biogas from every digester was measured by water displacement approach. The cattle dung biogas ignited on the 14th day, cattle dung with cassava peels mixture on the 55th and cattle dung with plantain peels mixture, 146th day of digestion. Their biogas volumes were 6450, 7000 and 6500 ml. Bacteria identified on the three digestates were Clostridium spp. and Bacillus licheniformies with a population of 2.5 x 10-4, Pseudomonas spp. and Bacillus licheniformies 3.8 x 10-4, and Bacillus licheniformies with 2.3 x 10-4 cfu/ml. Cattle dung biogas recorded the least ignition time.