There is a lot of questions here about the future GOG sales and most of them end up looking for historical dates and analogies. I've made some effort here to gather the dates of all significant GOG sales from the last few years.

Now, look at the patterns and let's guess when will be the next GOG sale :)

=== 2024 ===
Halloween Sale - - - - - 28 Oct - 05 Nov
Autumn Sale - - - - - 26 Sep - 07 Oct
Back to School Sale - - - - - 26 Aug - 10 Sep
Summer Sale - - - - - 19 Jun - 10 Jul
Spring Sale - - - - - 20 Mar - 04 Apr
Love at First Pixel - - - - - 14-22 Feb
New Year Sale - - - - - 25 Jan - 05 Feb

=== 2023 ===
Winter Sale - - - - - 13 Dec - 04 Jan
Black Week - - - - - 21-28 Nov
Halloween Sale - - - - - 25 Oct - 01 Nov
Autumn Sale - - - - - 28 Aug - 11 Sep
Summer Sale - - - - - 12 Jun - 03 Jul
Spring Sale - - - - - 20 Mar - 03 Apr
We Love Games - - - - - 13-20 Feb
New Year Sale - - - - - 20-30 Jan

=== 2022 ===
Winter Sale - - - - - 12 Dec - 02 Jan
Black Friday Sale - - - - - 23-30 Nov
Halloween Sale - - - - - 27 Oct - 03 Nov
The GOG Sale - - - - - 25 Aug - 05 Sep
Find Your Indie Sale - - - - - 25 Jul - 01 Aug
Summer Sale - - - - - 06-27 Jun
Spring Games Festival - - - - - 21 Mar - 04 Apr
We Love Games - - - - - 14-21 Feb

=== 2021 ===
Winter Sale - - - - - 13 Dec - 05 Jan
Black Friday Sale - - - - - 26-29 Nov
Halloween Sale - - - - - 27 Oct - 02 Nov
GOG Games Festival - - - - - 19 Aug - 02 Sep
Summer Sale - - - - - 09-28 Jun
Spring Sale - - - - - 22 Mar - 05 Apr
We Love Games - - - - - 10-15 Feb

=== 2020 ===
Winter Sale - - - - - 16 Dec - 04 Jan
Black Friday Sale - - - - - 27 Nov - 01 Dec
Halloween Sale - - - - - 26 Oct - 02 Nov
Harvest Sale - - - - - 24 - 31 Aug
Summer Sale - - - - - 27 May - 15 Jun
Spring Sale - - - - - 16-30 Mar
Lunar Sale - - - - - 24-31 Jan

=== 2019 ===
Winter Sale - - - - - 11 Dec - 02 Jan
Black Friday Sale - - - - - 28 Nov - 03 Dec
Halloween Sale - - - - - 28 Oct - 04 Nov
Summer Sale Festival - - - - - 30 May - 17 Jun
Spring Sale - - - - - 21-28 Mar
Lantern Festival Sale - - - - - 18-25 Feb
Hot Midweek Sale - - - - - 23-30 Jan

=== 2018 ===
Winter Sale - - - - - 13 Dec - 03 Jan
Black Friday Sale - - - - - 21-27 Nov
10th Anniversary Sale - - - - - 01-07 Oct
Back to School Sale - - - - - 03-10 Sep
SummerGaming Sale - - - - - 04-18 Jun
The Most Wanted Games Sale - - - - - 16-23 Apr
St. Patrick's Day Sale - - - - - 12-19 Mar
Chinese New Year Sale - - - - - 13-20 Feb
New Year's Resolutions Sale - - - - - 08-15 Jan

=== 2017 ===
Winter Sale - - - - - 12-26 Dec
Black Friday Sale - - - - - 21-29 Nov
Halloween Sale - - - - - 26 Oct - 2 Nov
Big Deal Sale - - - - - 18-25 Sep
Piñata Madness - - - - - 14-21 Aug
Summer Sale - - - - 06-20 Jun
Spring Sale - - - - - 06-12 Mar
From Wishlists, With Love - - - - - 13-20 Feb

=== 2016 ===
Goodbuy 2016 Sale - - - - - 22-24 Dec
Monstrous Winter Sale - - - - - 01-08 Dec
Black Friday Weekly Sale - - - - - 22-29 Nov
Monstrous Fall Sale - - - - - 03-10 Nov
Back to School Sale - - - - - 26-30 Oct
Summer Sale - - - - - 08-17 Jun
Bundleopolis - - - - - 25-29 Apr
Sleepy Sheep Insomnia Sale - - - - - 21 Mar

=== 2015 ===
Winter Sale - - - - - 02-12 Dec
Big Fall Finale - - - - - 04-13 Nov
Indie Piñata Sale - - - - - 11-18 Sep
DRM-Free Summer Sale - - - - - 03-19 Jun
Bundle Tower - - - - - 13-17 Apr
Double Insomnia Sale - - - - - 02-08 Mar

=== 2014 ===
DRM-Free Winter Sale - - - - - 04-15 Dec
DRM-Free Big Fall Sale - - - - - 14-23 Nov
Mutator Sale (pick 3 games) - - - - - 06-10 Oct
GOG Birthday Sale - - - - - 08-14 Sep
Summer Flash Sale - - - - - 13-29 Jun
Spring Insomnia Sale - - - - - 12-14 May
Battle of Games - - - - - 14-19 Apr
Pick 5 Games - - - - - 14-21 Mar
Time Machine Sale - - - - - 28-31 Jan

=== 2013 ===
Let's Party - - - - - 31 Dec - 02 Jan
Winter Sale - - - - - 12-28 Dec
Fall Insomnia Sale - - - - - 13-14 Nov
Summer Sale - - - - - 18 Jun - 04 Jul
Pick 5 Games - - - - - 15 Mar

=== 2012 ===
Winter Sale - - - - - 12 Dec - 02 Jan
Battle of Games - - - - - 18 Jun - 05 Jul

=== 2011 ===
Holiday Sale - - - - - 12 Dec - 02 Jan
Summer Hidden Gems - - - - - 07-25 Jul

=== 2010 ===
Holiday Sale - - - - - 14 Dec - 03 Jan

=== 2009 ===
Holiday Sale - - - - - 21 Dec - 03 Jan

In case of any mistakes, please, let me know. I'm going to update this post with all the future sales and I would also like to make some further research regarding previous years.

Please, remember that guessing the future sales' dates is just a fun. It cannot be predicted precisely and it's obviously the business secret of GOG team, however there are some rules and patterns, which seems obvious, when you look at dates above.

So - what's your guess? :)

Soon™

...yeah, yeah, I'm getting out.

Probably nothing big until March. So wallet is mostly safe.

Exactly. Moreover, it's quite a big chance that it would not be a regular big "flat" sale (with most of titles discounted), but something different - flash offers limited in time or quantity.

It seems that proper sales start in the summer, and then almost every month there is one until the winter.

They usually do a little something special for Valentine's Day. Not store wide but for selected titles. So that will probably be the next unique mini-sale.

A clearance sale.

Who cares... serious sales fatigue here...

Now new releases on the other hand...

I had something funny to add but thanks to the lazy lying ignorant fuckheads at GOG I can't post links any more.

Way to go.

Bradly can post links. I can't. This is fair. :P

Isn't there a workaround for posting links? LIke posting the URL without the http(s)-colon-slash-slash at the beginning, or something like that?

I don't want a work around, I want a fix, but I'm not going to derail this thread anymore so I'll drop it.

:(

This is somehow comforting to know that I have at least a couple of months to try to catch up on the games I bought in December, and have my budget get back to a reasonable state before it gets ruined again by the next sale.

Cool, thanks for your effort. So next sale will probably be in March/April...I hope they'll have some interesting new releases till then.

Absolutely agree. But it also is interesting to see that sales were never in January, February, May, July or August. So never at the beginning of the year or during the summer vacation. Sales are weak during that time anyway, I guess.