Introduction: Local impedance (LI) at the tip of ablation catheter can be measured using a recently available technology. We aimed to explore target LI measurements at each radiofrequency application (RFA) for creating sufficient ablation lesions during pulmonary vein (PV) isolation. Methods: This prospective study included 15 consecutive patients scheduled to undergo an initial ablation of paroxysmal atrial fibrillation (AF). Circumferential ablation around both ipsilateral PVs was performed using a 4‐mm irrigated ablation catheter with an LI sensor. Point‐by‐point ablation was used with a 4‐mm inter‐ablation‐point distance. Operators were blinded to LI measurements during the procedure. Creation of sufficient ablation lesions was assessed by the absence of a conduction gap. Results: After first‐pass encircling PV antrum ablation, left atrium to PV conduction remained in 12 of 30 (40%) ipsilateral PVs. Mapping using the minibasket catheter identified 48 ablation points through which the propagation wave entered the PV. At ablation points with a gap, the LI drop during RFA was half that at points without a gap (12 ± 7 vs. 23 ± 12 Ω; p <.001). The generator impedance drop did not differ between ablation points with and without a gap (12 ± 7 vs. 14 ± 10 Ω; p =.10). An LI drop of 13.4 Ω predicted sufficient lesion formation without a gap with a sensitivity of 0.78, specificity of 0.75, and predictive accuracy of 0.75. Conclusion: An LI drop of 13.4 Ω at each RFA under the conditions of a 4‐mm inter‐ablation‐point distance and RFA duration ≥20 s may facilitate creation of sufficient lesions during PV isolation.