Neptune will stay in Aries from January 26, 2026 until March 23, 2039, which is a bit over 13 years (often rounded to “about 14 years” in astrology articles).

Quick Scoop: Dates & Timeline

  • First preview of Neptune in Aries: March 30, 2025 to October 22, 2025 (it briefly entered Aries, then slipped back into Pisces).
  • Final entry for the long stay : January 26, 2026.
  • Neptune remains in Aries until March 23, 2039.
  • Overall, that’s roughly 13 years of Neptune in Aries shaping collective dreams, spirituality, and trends.

Think of 2025 as the trailer, and 2026–2039 as the full movie run of Neptune in Aries.

What this long transit means (briefly)

Astrologers describe Neptune in Aries as a period when idealism, spirituality, and imagination fuse with Aries-style qualities: initiative, boldness, and a drive to act. You may see themes like:

  • Stronger focus on individual spiritual paths and “do-it-yourself” mysticism.
  • New waves in art, music, and media centered on courage, activism, and identity.
  • Collective questioning of old authorities and a push toward more “embodied” spirituality (living your ideals in real life, not just talking about them).

So if you’re tracking “how long will Neptune be in Aries,” you’re looking at a whole era: 2026–2039.

TL;DR: Neptune is in Aries for its main run from January 26, 2026, to March 23, 2039—around 13 years, with a short preview in 2025.

Information gathered from public forums or data available on the internet and portrayed here.