Sun tracking

Does anyone know of an accurate sun tracking app that includes topography?

My partner and I are looking to buy a Small piece of property in Cascade Locks but are very concerned about the amount of sun it gets due to being nestled north of a mountain range, at the foot of it.  Obviously, full sun without impediment would be preferred but we are trying to figure out just how bad this area might be for gardening.  It gets a Lot of rain in Cascade Locks which I'm fine with but that, added to potentially consistent shade, needs to be a known versus unknown variable before we sign the mortgage documents.

Are you looking to use the app when you're on the site or do you need to assess it from afar?  

There are a number of apps like SunSeeker that will show you the path of the sun for any day of the year and show it through your phone's camera.  That way you can see how it clears trees and mountains.

I need it from afar.  I downloaded SunSeeker (paid :( ) but it doesn't seem to do what I was hoping.  

Google Earth [edit: Pro] is nice for that. Set the date to what you want to check, go into ground view by placing the person icon on the map and adjust the time slider.

The view of what you pasted into your message looks to be exactly what I want and I can't figure out how to get there.  I'm So Frustrated...  Any tips?  I can't figure out where to even enter a date.  I finally found the "timelapse" version of Google Earth but it doesn't allow me to "see" closer than the whole town, let alone drop a person icon onto the property.  Obviously I'm on the wrong page or something, I've been trying the "Help" feature and it isn't getting me anywhere.

OK, looks like the issue is I'm not using Google Earth Pro.  Considering they want me to download onto my computer I can't go any farther with it.  I appreciate the attempt folx

There is a lot of functionality with the desktop version of Google Earth Pro that is missing from the mobile app that I assume you have. One thing you could do is use the GE app to determine the elevation of the lot and then use the app's measuring feature to measure the distance to the high terrain that will block the sun. The SunSeeker app should give you the angle of the sun on any date, allowing you to calculate the duration of sunshine on any particular spot. A good topo map of the area could be used to the same effect in conjunction with the info the SunSeeker app provides.