The objective was to determine the effect of feeding zeolite A during the prepartum period on performance. Holstein cows (n = 55) entering second or greater lactation were assigned randomly to 1 of 2 dietary treatments starting 21 d before expected calving; Control (CON): 40% corn silage, 33% wheat straw, and 27% concentrate or Experiment (EXP): CON plus zeolite A (X-Zelit, Protekta Inc., ON, Canada/Vitfoss, Graasten, Denmark) at 3.3% of DM, targeting 500 g/d as-fed. Intake, rumination (HR Tags, SCR Dairy, Netanya, Israel), and milk production were recorded daily. Colostrum and milk samples (1×/wk) were collected for composition and multiple peripartum blood samples were analyzed for oxidative stress. Data were analyzed in SAS with PROC MIXED and repeated-measures analysis was conducted for measures with multiple time points. Survival analysis for time to pregnancy by 150 DIM was analyzed with PROC LIFETEST. Cows fed EXP tended to have lower prepartum DMI (14.0 ± 0.2 kg/d vs. 14.6 ± 0.2 kg/d, P = 0.07) but not when expressed as a percent of BW (P = 0.44). Prepartum rumination was higher in cows fed CON (521 ± 6 min/d vs. 500 ± 7 min/d, P < 0.01). There was no difference in postpartum DMI (P = 0.51) or rumination (P = 0.61). Oxidative status, expressed as reactive oxygen and nitrogen species/the antioxidant potential, was not different between treatments pre- or postpartum (P ≥ 0.54). There was no difference in colostrum quantity (CON: 7.3 ± 0.7 kg vs. EXP: 5.8 ± 0.8 kg, P = 0.16) or IgG concentration (CON: 7629 ± 455 g/L vs. EXP: 8342 ± 484 g/L, P = 0.29). There was a tendency for cows fed EXP to have higher percentage of milk protein (3.30 ± 0.05% vs. 3.19 ± 0.04%, P = 0.09), total solids (13.32 ± 0.11% vs. 13.03 ± 0.11%, P = 0.07) and there was a treatment by week effect for percent fat (P = 0.05) such that EXP fed cows had higher milk fat content, particularly in wk 3 and 4. There were no effects of treatment on milk yield (wk 1–4: P = 0.60; wk 1–9: P = 0.37), ECM (P = 0.50), or ECM/DMI (P = 0.94). Median time to pregnancy for EXP cows was 70 d and 89 d for CON cows (P = 0.17). Overall, postpartum performance was similar between both treatment groups.