The paper aims to assess and reduce the risks associated with infrastructure, financial, natural and environmental, farm management, and political changes among smallholders in tomato supply chain entities. Uncertainties related to the producer, buyer, infrastructure, finance, natural and environmental, management, and political changes in STSC take into account risk levels' assessment. These threats were assessed using Fuzzy Linguistic Quantifier Order Weighted Aggregation (FLQOWA) model. The obtained results showed the level of risk arising in production, cooperation, infrastructure, and financial issues. At the same time, measures to reduce risk levels were taken in the study. According to the results, applying "written contract" and "insurance" to collaborative relationships to reduce risk levels has been shown to reduce risks to 0.6 coefficients. The results obtained from this investigation will have a positive effect if policymakers use the applications to increase the economic cooperation between the subjects in STSC.