Thanks for all of the tips above!! I visited paso for a month, and knew nothing about it before arriving. Here are my notes:
epoch - favorite overall tasting, very scenic location. they serve more library wines than anywhere else I visited (all of the reds were 2011-2016). 2014 Ingenuity was my favorite. $30 tasting fee waived with $100 purchase.
torrin - favorite single wine of the trip was tsundere. their tasting menu was 1 chard, 2 lagom series pinots, and only 2 “torrin” label reds (tsundere and akasha). They did offer a bonus 2018 new release red that had been returned by a member, but not sure how common that is. scenic outdoor tasting patio, worth a stop. The tasting fee was 30 and only waived if you become a member.
turtle rock - don’t miss this if you’re in tin city! wines were top notch, several reds sourced from james berry and/or g2. clyde’s cuvee was my favorite. I believe the tasting was “officially” $20 waived with 2 bottle purchase but they seemed generous about waiving tasting fees with any purchase.
desperada - another excellent tin city stop! really interesting red blends, crossing rhone/bordeaux features in ways that work surprisingly well. This was probably the top qpr winery I visited. Reds are very reasonably priced around $40. $20 tasting fee waived with 2 bottle purchase.
l’aventure - excellent traditional style rhone blends. really pretty tasting area tucked back in the hills. Reds are in the $80 to $110 range with the exception of optimus ($60). $35 tasting fee only waived if you become a member. Good tasting list, including a few member only bottles like cote a cote. I like that they give you all 6 pours at once (as does epoch). I don’t buy many $80+ bottles, and for a splurge bottle I’d probably go with torrin. l’aventure was a little more in the direction of old world style than others I tasted.
denner - very pretty outdoor tasting patio, and excellent rhone blends. Reds are on the high end at $70-90ish. the 2018 dirt worshiper is worth seeking out, and they had some discounts on 2013 library bottles available when I visited. $20 tasting fee waived with purchase of one bottle.
halter ranch - really pretty location (probably my favorite in terms of scenery). $35 tasting fee waived with 2 bottles, several decent bottles available in the $40s. My favorite was the 2018 CDP. They make a lot of different wines, and are generous about customizing tastings to your preferences. Fun experience, not sure the bottles will be a repeat purchase for me at retail prices.
Other tip:
Paso Market Walk (downtown) has a great little wine shop “Paso Robles wine merchant” with an excellent selection of well-priced pours by the glass (including epoch, library nicora, etc). Bottle selection is small but well curated, focused on some of the smaller local producers. Also a good vegan cheese shop for pairings. Nice outdoor seating. Highly recommend!!