Seems there was no way of hiding future blog posts, I searched on here, but couldn't find an answer. So for anyone in the future, you need to edit Blog/code/BlogTree.php on line 251 there is BlogEntries(), replace the filter if statement with this:

		if ($this->LandingPageFreshness && !$this->request->param('Action')) {
			if(defined('DB::USE_ANSI_SQL')) {
				$filter = "\"BlogEntry\".\"Date\" < NOW() - INTERVAL " . $this->LandingPageFreshness;
			} else {
				$filter = "`BlogEntry`.Date < NOW() - INTERVAL " . $this->LandingPageFreshness;
			}
		} else {
			/**** THIS IS THE PART THAT IS CHANGING ****/
			if(defined('DB::USE_ANSI_SQL')) {
				$filter = "\"BlogEntry\".\"Date\" < NOW()";
			} else {
				$filter = "`BlogEntry`.Date < NOW()";
			}
		}

I'm trying to do this as well, is this still the correct approach to be able to schedule future posts? This post was over a year ago so the code in my file looks different. Below is what shows up in my code, can anyone tell me what I should be modifying?

// only use freshness if no action is present (might be displaying tags or rss)
		if ($this->LandingPageFreshness && !$this->request->param('Action')) {
			$d = new Zend_Date(SS_Datetime::now()->getValue());
			$d->sub($this->LandingPageFreshness);
			$date = $d->toString('YYYY-MM-dd');
			
			$filter = "\"BlogEntry\".\"Date\" > '$date'";
		} else {
			$filter = '';
		}