Gibberellic acid (GA3), a plant growth regulator (PGR), is widely used to enhance the yield and quality of various crops, including groundnut (Arachis hypogaea). However, the effects of GA3 concentration and spray frequency on the growth, yield, and maturation of groundnut, particularly the BARI Chinabadam‐8 variety, remain under‐explored. This study aimed to evaluate the impact of GA3 on groundnut growth and yield parameters under different concentrations and spray frequencies. For this purpose, an experiment was performed at the char land area farmers' field under Bhuapur upazila of Tangail District in the Rabi season of 2019–2020 to observe the impacts of various concentrations and frequencies of spray of GA3 on the growth, yield, and maturation of groundnut with the variety BARI Chinabadam‐8. The treatment comprised six levels of GA3 (0, 100, 150, 200, 250, and 300 ppm) and three spraying frequencies: one spray at 21 DAS (days after sowing), one spray at 42 DAS, and two sprays at 21 and 42 DAS. The results showed that 250 ppm GA3 (T5) with two sprays at 21 and 42 DAS (F2) produced the highest values for mature pods plant−1 (32.57), total pods plant−1 (48.90), and pod weight plant−1 (27.90 g in the pot experiment and 47.69 g in the field experiment). The highest biological yield (BY) was also recorded at T5F2, with 6700 kg ha−1 in the pot and 6800 kg ha−1 in the field. In contrast, the control treatment (T1, 0 ppm GA3) with one spray at 21 DAS (F1) had the lowest values across most parameters, including mature pods plant−1 (19.60), total pods plant−1 (34.49), and BY (5400 kg ha−1 in the pot experiment and 5000 kg ha−1 in the field experiment). Correlation analysis revealed positive associations between GA3 dosage and various yield parameters, with significant improvements in pod yield (PY) and seed quality. Furthermore, principal component analysis (PCA) indicated strong positive correlations between GA3 dosage and traits such as PY, harvest index (HI), and oil content. These findings suggest that GA3, particularly at 250 ppm with two sprays at 21 and 42 DAS, significantly improves both the yield and quality of groundnut, highlighting its potential for enhancing production in similar agro‐ecosystems.