3 reasons for dark blond hair in winter

By Zoé-Ema J.

Last modified Sep 3, 2025

1. Increased pollution and oxidative stress

In winter, your body is subjected to more oxidative stress - caused by lack of light, seasonal fatigue and air pollution.

This oxidative stress generates free radicals that attack the lipids and proteins in the hair.

Result: the fiber becomes damaged, duller and loses its ability to reflect light.

The blonde therefore appears darker, "dirtier" visually, even without pigment change.

2. Lower natural oxidation of melanin

Hair color depends mainly on melanin.

In summer, exposure to UV rays and heat causes photo-oxidation of melanin, i.e. a natural breakdown of dark pigments (eumelanin).

Result: hair lightens slightly, hence the summery golden highlights.

In winter, this oxidation no longer occurs: melanin remains stable, making the shade darker and "cooler" visually.

3. Modification of light reflection

Cold and heat alter the hydrolipidic film of the hair.

The scales lift, the surface becomes irregular and light scatters instead of being reflected.

Result: hair looks dull, matte, and darker.

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