Will it be too hot/rainy? My wife is coming with me, I will only be climbing for a few days, then heading for the coast. She does not climb, is there enough things around Hidalgo to keep her interested while I am out climb? Is it relatively safe for a foreign female to be alone during the day in this area?

April is still good for climbing here. It will be hotter for sure than it is now but there is plenty of shade to climb in. As far as non-climbing entertainment, it really depends on what she would find entertaining. There's tons of city-ish things to do in Monterrey. It's a very artsy city. There's also tons of hiking and exploring to do right here in Hidalgo. The trails are definitely not as developed as other places. Very fun though. I think she could stay busy if it was just for a few days.

This makes my whole response to your question sound selfish but I saw you are in Boulder. I've been looking to work out a deal for someone who is driving from CO to bring my bike down with them. If you think you might drive and are coming through here, I would love to be in contact with you.

Feel free to contact me if you have any other questions.

Dont think its rainy then. We were there in early april and the first few days were mid 50s in the early morn and high 70s for the highs, gorgeous, then it got insanely hot a few days later. Couldnt climb any exposed walls after late morning, but the virgin canyon stayed cool, dry and breezy all day, and there's lots to climb in there and in other shady areas (since its the desert, any shade is pretty cool, and usually nicely breezy - just bring lots of water).

The last day it suddenly dropped back to a high of 75 (but i still wore a white shirt and 3/4 length beige climbing pants in case :), so we hit TWZ with no incidents (except some swearing about the idiot that put the 5.12 up on the 20th pitch - and thanks to the angels who bolted all that and put up the fixed rope at the top - recently replaced according to Magic Ed ;) -- one of the best climbing experience of my life, just zoned out like on a marathon, climbing, climbing, climbing, just me and the rock for most of the day, so dialed in, so focused, it was bliss -- oh, occasionally I talked to this other dude, my partner.. ;)

As for female tourist, alone, couldnt say, but depending how many days and your budget, Milton (manages Homero's) is the nicest sweetest guy on the planet - he guided us in Monterrey for the day, was great. Think you can contact him thru Homero's webpage or maybe on Facebook...

You might want to read this before making any plans:

rockice.amgbusiness.com/lates-news/18-murdered-near-potrero->>>

and this thread:
www.mountainproject.com/v/el-potrero-chico-/107982712