Winter Frost Palette

Frost on glass at dawn — cold blues and whites with almost no warmth.

#0B3D91

deep ice-shadow blue

HSL 218° 86% 31%

10.0:1 on white

#4A90D9

sky blue

HSL 211° 65% 57%

3.3:1 on white

#A9CCE3

frost blue

HSL 204° 51% 78%

1.7:1 on white

#E8F1F8

near-white haze

HSL 206° 53% 94%

1.1:1 on white

#FFFFFF

pure white

HSL 0° 0% 100%

1.0:1 on white

Using this palette

Deliberately monochrome — every swatch sits on the same blue hue line, only moving in lightness, which is exactly how frost actually looks: no warmth, just gradations of one cold color from shadow to glare. That makes this palette easy to misuse as flat and boring; the fix is contrast in scale rather than hue — pair a large field of #E8F1F8 or white with a small, hard-edged block of #0B3D91 for logos, icons, or a single CTA. #0B3D91 on white clears AA for body text; #A9CCE3 does not, so keep it to backgrounds and dividers, never small text.