Best Days to Dye Hair in May 2021
The best days to dye your hair in May 2021 are 1, 2, 10, 12, 18, 19, 20, 21, 22, 23, 28 and 29, with 10, 12, 20, 21, 22 and 23 the most favourable (Moon in Taurus, Virgo or Libra). Skip 5, 6, 11, 15, 16, 17, 24, 25 and 26 (New Moon — 11 May · Full Moon — 26 May). These readings follow lunar folk tradition — the Moon’s phase and zodiac sign.
What to do when
Waxing Moon in a favourable sign — tradition says the colour is richer and lasts longer.
Waning Moon in a favourable sign — hair grows more slowly, so roots show later.
Moon in Virgo or Libra; in Leo — tighter curls.
Moon in Taurus — by tradition the gentlest day if dye irritates your scalp.
Day by day
| Day | Phase | Sign | Verdict | Suits |
|---|---|---|---|---|
| 1 Sat | 74% · waning | Capricorn | Good day | Roots and refresh |
| 2 Sun | 64% · waning | Capricorn | Good day | Roots and refresh |
| 3 Mon | 53% · waning | Aquarius | Neutral day | |
| 4 Tue | 43% · waning | Aquarius | Neutral day | |
| 5 Wed | 33% · waning | Pisces | Unfavourable day by tradition | |
| 6 Thu | 24% · waning | Pisces | Unfavourable day by tradition | |
| 7 Fri | 16% · waning | Aries | Neutral day | |
| 8 Sat | 10% · waning | Aries | Neutral day | |
| 9 Sun | 5% · waning | Aries | Neutral day | |
| 10 Mon | 1% · waning | Taurus | Excellent day to colour | Roots and refresh Sensitive scalp |
| 11 Tue | 0% · waning | Taurus | Rest day — no colouring | |
| 12 Wed | 0% · waxing | Taurus | Excellent day to colour | New colour Sensitive scalp |
| 13 Thu | 3% · waxing | Gemini | Neutral day | |
| 14 Fri | 7% · waxing | Gemini | Neutral day | |
| 15 Sat | 12% · waxing | Cancer | Unfavourable day by tradition | |
| 16 Sun | 19% · waxing | Cancer | Unfavourable day by tradition | |
| 17 Mon | 28% · waxing | Cancer | Unfavourable day by tradition | |
| 18 Tue | 37% · waxing | Leo | Good day | New colour Perm |
| 19 Wed | 47% · waxing | Leo | Good day | New colour Perm |
| 20 Thu | 58% · waxing | Virgo | Excellent day to colour | New colour Perm |
| 21 Fri | 69% · waxing | Virgo | Excellent day to colour | New colour Perm |
| 22 Sat | 79% · waxing | Libra | Excellent day to colour | New colour Perm |
| 23 Sun | 87% · waxing | Libra | Excellent day to colour | New colour Perm |
| 24 Mon | 94% · waxing | Scorpio | Unfavourable day by tradition | |
| 25 Tue | 99% · waxing | Scorpio | Unfavourable day by tradition | |
| 26 Wed | 100% · waning | Sagittarius | Rest day — no colouring | |
| 27 Thu | 98% · waning | Sagittarius | Neutral day | |
| 28 Fri | 94% · waning | Capricorn | Good day | Roots and refresh |
| 29 Sat | 87% · waning | Capricorn | Good day | Roots and refresh |
| 30 Sun | 78% · waning | Aquarius | Neutral day | |
| 31 Mon | 68% · waning | Aquarius | Neutral day |
Phase and sign are computed for 12:00 UTC on each day. The Moon changes sign every ~2.3 days — the exact moments are listed below.
The Moon changes sign
- Aquarius(Air · for bold experiments — no clear call)2 May, 19:32
- Pisces(Water · folk belief: colour fades fast)5 May, 02:10
- Aries(Fire · mixed folk readings — no clear call)7 May, 11:54
- Taurus(Earth · lasting colour, gentle on a sensitive scalp)9 May, 23:47
- Gemini(Air · mixed folk readings — no clear call)12 May, 12:45
- Cancer(Water · folk belief: colour does not take well)15 May, 01:34
- Leo(Fire · rich colour and shine)17 May, 12:49
- Virgo(Earth · colour takes evenly and covers well)19 May, 21:03
- Libra(Air · the best day to change colour or shade)22 May, 01:36
- Scorpio(Water · folk belief: unpredictable result)24 May, 02:59
- Sagittarius(Fire · mixed folk readings — no clear call)26 May, 02:40
- Capricorn(Earth · lasting coverage, grey hair included)28 May, 02:25
- Aquarius(Air · for bold experiments — no clear call)30 May, 04:06
Times are UTC.
Frequently asked questions
Which are the best days to dye hair in May 2021?
The good days are 1, 2, 10, 12, 18, 19, 20, 21, 22, 23, 28 and 29; the best — 10, 12, 20, 21, 22 and 23 (Moon in Taurus, Virgo or Libra).
When should I go for a new colour in May?
Under a waxing Moon in a favourable sign — in May 2021 that is 12, 18, 19, 20, 21, 22 and 23.
When should I do my roots in May?
Under a waning Moon in a favourable sign — 1, 2, 10, 28 and 29 May.
Which days should I avoid in May 2021?
Tradition skips 5, 6, 11, 15, 16, 17, 24, 25 and 26 — the new and full moon (New Moon — 11 May · Full Moon — 26 May) and the days with the Moon in Cancer, Pisces or Scorpio.
When is a good day for a perm in May 2021?
With the Moon in Virgo, Libra or Leo — 18, 19, 20, 21, 22 and 23 May.
Is there scientific evidence?
No. The moon phase and sign are astronomically computed and verifiable, but their link to hair colour is folk belief. This page reproduces the rules of the popular lunar almanacs as entertainment — it is not advice.
The moon phase and its zodiac sign are computed astronomically (tropical zodiac). The colouring rules are folk tradition from the popular lunar almanacs — reproduced for entertainment and curiosity; they are not advice and have no scientific confirmation.