Color spec
| Brand | Valspar |
| Name | Mountain River |
| SKU | 4005-6C |
| Hex | #3F576A |
| RGB | 63, 87, 106 |
| HSL | 207°, 25%, 33% |
| LRV | 9 |
| Undertone | cool blue tone |
| Family | Blue |
About Valspar Mountain River
At LRV 9, Mountain River is about as dark as paint gets — it reads near-black on a wall and reveals its character only in direct daylight or under warm bulbs. Its blue undertone is the part to watch: it gets picked up by whatever sits next to it, so test it against your trim, floor and the room's main light before committing. In rooms with little natural light it can feel heavy, so reserve it for spaces you want to feel enveloping.
Mountain River earns its keep as a statement: accent walls, a front door, cabinetry, a moody powder room, or exterior trim where you want sharp contrast. Blues calm a room, which makes them popular in bedrooms, bathrooms and home offices.
Closest matches by brand
17 brands within ΔE 5The closest matches per brand by ΔE2000, computed against each brand's full deck. Only colors within ΔE 5 (close enough to substitute on a wall) are shown — brands with no real match are left off. Tap any swatch for its full single-color spec; tap the brand title to browse all blue from that brand.
Sherwin-Williams
Behr
Benjamin Moore
PPG / Glidden
Glidden
Dutch Boy
HGTV Home by Sherwin-Williams
Dunn-Edwards
Magnolia Home
Farrow & Ball
Diamond Vogel
Hirshfield's
Rodda
C2 Paint
Portola Paints
Backdrop
Kompozit
Similar Valspar colors
closest in the Valspar deckThe nearest shades to Mountain River within Valspar's own range, ranked by perceptual color distance — useful when you want the same look a touch lighter, darker, or warmer.
Coordinated palette
Generated by hue-rotating #3F576A in HSL space. Pair Mountain River with one accent and one neutral — the swatches below are starting points, not final picks.
Accessibility (WCAG contrast)
WCAG 2.1: AA = 4.5:1 normal text · AA Large = 3:1 large text · AAA = 7:1 normal text.
Valspar Mountain River Equivalents at Other Brands
Matching Mountain River from a different paint counter? Below is the single closest color in each major US deck and how close it really is. Remember that any paint store can also custom-tint Valspar 4005-6C directly — these equivalents are for when you'd rather stay inside one brand's own deck.
Sherwin-Williams Equivalent of Mountain River
At Sherwin-Williams, the closest color to Mountain River is Endless Sea (SW 9150) — very close at ΔE 3.21, though not an exact twin. It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Endless Sea swatch →
Behr Equivalent of Mountain River
Behr's nearest match is Inlet Harbor (ECC-16-3), visually identical in normal room light (ΔE 1.33). It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone, so it substitutes for Mountain River without repainting risk. See the full Inlet Harbor swatch →
Benjamin Moore Equivalent of Mountain River
At Benjamin Moore, the closest color to Mountain River is Newburyport Blue (HC-155) — very close at ΔE 2.91, though not an exact twin. It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Newburyport Blue swatch →
Glidden Equivalent of Mountain River
Glidden has no exact twin of Mountain River. The nearest is Oceania (PPG10-01) at ΔE 4.26 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 9 vs 9). Compare large swatches before substituting. See the full Oceania swatch →
Dutch Boy Equivalent of Mountain River
Dutch Boy's nearest match is Alaskan Night (337-6DB), visually identical in normal room light (ΔE 1.27). It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone, so it substitutes for Mountain River without repainting risk. See the full Alaskan Night swatch →
HGTV Home by Sherwin-Williams Equivalent of Mountain River
At HGTV Home by Sherwin-Williams, the closest color to Mountain River is Spectral Indigo (HGSW 3341) — very close at ΔE 3.21, though not an exact twin. It sits at the same lightness (LRV 8 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Spectral Indigo swatch →
Dunn-Edwards Equivalent of Mountain River
At Dunn-Edwards, the closest color to Mountain River is Summer Night (DE5811) — very close at ΔE 2.67, though not an exact twin. It sits at the same lightness (LRV 8 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Summer Night swatch →
Magnolia Home Equivalent of Mountain River
Magnolia Home's nearest match is Together (JG-87), visually identical in normal room light (ΔE 1.44). It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone, so it substitutes for Mountain River without repainting risk. See the full Together swatch →
Farrow & Ball Equivalent of Mountain River
At Farrow & Ball, the closest color to Mountain River is Stiffkey Blue (NO. 281) — very close at ΔE 2.69, though not an exact twin. It sits at the same lightness (LRV 10 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Stiffkey Blue swatch →
Hirshfield's Equivalent of Mountain River
At Hirshfield's, the closest color to Mountain River is Saxon Blue (H0052) — very close at ΔE 3.38, though not an exact twin. It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Saxon Blue swatch →
Rodda Equivalent of Mountain River
Rodda's nearest match is Stellar Feather (R077), visually identical in normal room light (ΔE 1.91). It sits at the same lightness (LRV 10 vs 9) and carries a cool blue undertone, so it substitutes for Mountain River without repainting risk. See the full Stellar Feather swatch →
C2 Paint Equivalent of Mountain River
At C2 Paint, the closest color to Mountain River is Major Tom (C2-760) — very close at ΔE 2.14, though not an exact twin. It sits at the same lightness (LRV 9 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Major Tom swatch →
Portola Paints Equivalent of Mountain River
Portola Paints has no exact twin of Mountain River. The nearest is Blue Moon (BLUE MOON) at ΔE 4.24 — close, but the difference shows next to trim and in side light. It sits at the same lightness (LRV 9 vs 9). Compare large swatches before substituting. See the full Blue Moon swatch →
Backdrop Equivalent of Mountain River
At Backdrop, the closest color to Mountain River is We Three Kings (BD-WK) — very close at ΔE 2.83, though not an exact twin. It sits at the same lightness (LRV 8 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full We Three Kings swatch →
Kompozit Equivalent of Mountain River
At Kompozit, the closest color to Mountain River is Day Spa (0634) — very close at ΔE 2.14, though not an exact twin. It sits at the same lightness (LRV 8 vs 9) and carries a cool blue undertone; sample both side by side if the room gets strong natural light. See the full Day Spa swatch →