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<b><i>Introduction:</i></b> Pulmonary hypertension (PH) is the major pathophysiologic consequence of congenital diaphragmatic hernia (CDH). We aimed to evaluate the association between early CDH-associated PH (CDH-PH) and inpatient outcomes. <b><i>Methods:</i></b> The CDH Study Group registry was queried for infants born 2015–2019 with echocardiograms before 48h of life. PH was categorized using echocardiographic findings: none, mild (right ventricular systolic pressure &#x3c;2/3 systemic), moderate (between 2/3 systemic and systemic), or severe (supra-systemic). Univariate and multivariate analyses were performed. Adjusted Poisson regression was used to assess the primary composite outcome of mortality or oxygen support at 30 days. <b><i>Results:</i></b> Of 1,472 patients, 86.5% had CDH-PH: 13.9% mild (<i>n</i> = 193), 44.4% moderate (<i>n</i> = 631), and 33.2% severe (<i>n</i> = 468). On adjusted analysis, the primary outcome of mortality or oxygen support at 30 days occurred more frequently in infants with moderate (incidence rate ratio [IRR] 1.8, 95% confidence interval [CI], 1.2–2.6) and severe CDH-PH (IRR 2.0, 95% CI, 1.3–2.9). Extracorporeal life support (ECLS) utilization was associated only with severe CDH-PH after adjustment (IRR 1.8, 95% CI, 1.0–3.3). <b><i>Discussion/Conclusion:</i></b> Early, postnatal CDH-PH is independently associated with increased risk for mortality or oxygen support at 30 days and utilization of ECLS. Early echocardiogram is a valuable prognostic tool for early, inpatient outcomes in neonates with CDH.