A new and distinct nectarine variety of Prunus persica named `NJN100` is provided. This variety is distinguished from other nectarine varieties by its unique combination of showy flowers, fruit that ripen in early-season, glossy fruit with an attractive red over color and greyed-white ground color, clingstone fruit with a juicy, melting texture and sweet, moderately acidic flavor, and excellent production of firm fruit that maintain their eating quality following cold storage.