In the Northern Hemisphere, November 15-January 1 is known as a major dead zone for forming new relationships through most game means. The only exception in November 15-January 1 is social circle through private residence parties.
I'd say it's through Valentine's Day (then again I'm not an LTR-seeking guy)
I don't think you can extend that behavior through Valentine's Day. Right after January 1, there are a ton of motivated singles out there looking to start something new. A lot of people just went through a miserable holiday season in November-December with a ton of couples centric gatherings. Additionally, some are feeling the sting of not having anyone to kiss when the clock strikes midnight on New Year's Eve/New Year Day. Activity on the swipe apps always picks up in January with the new year motivated singles. In the real world, some of these motivated singles can be found via stranger approaching too, though it's more difficult through random approaching in non-bar venues to find these motivated singles in January coming off of a crappy holiday season of gatherings.
There are also many women who find the nearest beta male during the Fall months to get into a relationship and then dump him right after Valentine's Day.
Women during Holiday Season (late Nov/early Dec through Valentine's Day) behave *much* differently than women on vacation.
There are so many holidays that come up that have social circle gatherings and strong romantic connotations that come up incessantly for 3 months from November to mid-February. I count 5 such occasions in less than 3 months.
1. Thanksgiving
2. Christmas
3. New Year's Eve
4. Super Bowl Sunday
5. Valentine's Day
A small request, OP: can you change the word "Holidays" in your headline to "Vacation". Women during Holiday Season (late Nov/early Dec through Valentine's Day) behave *much* differently than women on vacation.
For sure. A woman on a vacation is open to casual sex. Many women go on vacations to places like Las Vegas, Miami, and New Orleans for a long weekend and have casual sex before returning home. Women might even do 7-14 day vacations to beach spots and have some casual sex. Without the responsibility of a job and a regular life, they are more free to think about casual sex if unattached.
Women during the holiday season in the Northern Hemisphere, if unattached, are often acting like a royal pain. Scheduling early stage dates with these women is annoying because they are distracted by family and other non-sexual obligations.