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Crossfit participation has experienced exponential growth. Like other sports, it may be that successful participation in Crossfit would rely upon a construct known as grit. Grit is considered to be a combination of perseverance of effort (PE) and consistency of interest (CI) and has been assessed in other populations with the 12-point Grit Scale. The ability to reliably assess grit among Crossfit participants may allow participants and coaches to monitor the constructs of PE and CI in order to further develop Crossfit participation skills. Hence, the purpose of this study was to examine the reliability of the 12-point Grit Scale among adult Crossfit participants. The 12-point Grit Scale was electronically administered twice to 25 adult Crossfit participants (female:11, male:14) separated by at least two weeks. The results of the two administrations of the 12-point Grit Scale were then compared with a battery of statistical analyses in order to assess the reliability of the 12-point Grit Scale. The test-retest 12-point Grit Scale scores were: 49.8±5.3 and 50.2±5.4. The reliability statistics along with 90% confidence limits were as follows: interclass reliability coefficient was r=0.87 (UL:0.94, LL:0.73), intraclass reliability coefficient was ICC=0.91 (UL:0.96, LL:0.83), Standard Error of Measurement (SEm)=1.6 (UL:2.2, LL:1.3), ∆Means 12-point Grit Scores= -0.3±2.3 (UL:0.6, LL:-1.2), and typical error CV% =3.4 (UL:4.8, LL:2.7). The Bland-Altman plot suggested agreement between the two administrations of the 12-point Grit Scale with no evidence of heteroscedasticity. The results of the 12-point Grit Scale and subscales ranged from moderately-high to excellent reliability among adult Crossfit participants.