Food production is a global challenge and consequently, there is considerable interest in manipulating the rhizobiome using microbial inoculants (MI) to support sustainable agriculture. We investigated how three commercially-available types of plant growth-promoting MI, alone and in combination (B5: five species of Bacillus bacteria, GP: four species of Trichoderma fungi, N2: Paenibacillus polymyxa bacteria) impacted field pea (Fabales: Fabaceae, Pisum sativum L.) in the greenhouse and a two-year field experiment in the United States, North Dakota, NDSU Field Research station at Prosper ND. CON indicates controls that did not receive any MI and FC is the fertilizer control in the field experiment which also did not receive any MI. The dataset consists of data plant data from a 2-wk greenhouse experiment (GH 2wk), a 4-wk greenhouse experiment (GH 4wk), and a two-year field experiment (field). In the greenhouse, we found that effects of MI on plant performance varied, with positive effects of MI only apparent when plants were grown in the winter and likely under greater stress because they lacked nodules. Plants grown in the summer had nodules, and two-week-old MI plants had less root biomass and total plant weight than non-inoculated controls, but weight of four-week-old MI plants was similar to or greater than controls. In the field, the root-to-shoot biomass ratio was highest in non-inoculated controls, and positive effects of N2 on shoots and B5 on shoots and pod densities didn’t translate into differences in pod weight or total plant weight. In most cases, plants inoculated with all three inoculants performed similarly to those receiving a single inoculant, while root colonization by arbuscular mycorrhizal fungi (AMF) was higher for B5 plants than plants in the other treatments. This research underscores the need to consider microbial and environmental context when evaluating MI.