Hi -

BM Gray Gardens belongs to the Green-Yellow Hue Family, very close to the Green Hue Family.

In balanced lighting, many see near neutral colours from this Hue Family neighbourhood as ‘just grey’. But in certain situations, it may be possible to flashes of their inherent greenness. (Which is what you are spotting in other samples you have tried.)

Note also, that in some imbalanced light settings, low Chroma near neutrals, from this bottom right quadrant of the Color wheel can shift blue-ish. They aren’t blue and don’t have blue undertones, it’s an effect of light upon the colour.

The nearest match for Gray Gardens in another Benjamin Moore colour, is

HC-167 Amherst Gray.

But it’s still not super close. It is from the same Hue Family but sits anticlockwise, to Gray Gardens, near the beginning of the Yellow-Green Hue Family. It is almost the same Value (lightness,) but is that bit more colourful than Gray Gardens. Worth a look.

Thank very much for your helpful response; I really appreciate it.

I've looked at Amherst Gray (I've looked at all the BM grays!) but will now buy a sample and try it outside.

I never thought I'd gravitate toward the yellow-grays--I've always been a blue-gray person--but it's what my house exterior cries out for.

Thanks again for taking the time to respond.

You should be able to go to Ben Moore paint store and tell them the interior color you want to match with exterior paint, and they should be able to mix it for you.

Do you think they will be able to do that? I have had mixed results with this in the past. I guess it's worth an attempt. Thanks!

If that colour isn’t as you might hope, consider uploading a list of colours you have tried and what you liked & didn’t. e.g. too dark/light/blue/green/cool/warm etc etc

That can help narrow down more possible suggestions.