This study was carried out with 86 primary school teachers in Kenya's Narok County and explored factors affecting integration of ICT in teaching and learning. Multiple regression was used for data analysis. The results revealed that 32.5% of the variance was explained by the independent and extraneous variables (R[superscript 2] = 0.325, P = 0.001) and was statistically significant. Attitude was found to be a significant predictor of teachers' behavioural intention to use ICT in teaching and learning ([beta] = 0.259, p < 0.05) while performance expectancy ([beta] = 0.148, p > 0.05), effort expectancy ([beta] = -0.185, p > 0.05), social influence ([beta] = 0.029, p > 0.05), facilitating condition ([beta] = 0.194, p > 0.05), self-efficacy ([beta] = 0.195, p > 0.05) and anxiety ([beta] = 0.074, p > 0.05) were not significant predictors. The study recommends training of teachers on subject-specific ICT technologies, that laptops and computers be availed for use by teachers and pupils, that School Heads be trained on how to monitor and support integration of ICT by teachers and that governments provide schools with requisite ICT infrastructure.