I just found this spider yesterday in my backward and was about to walk right into it before I saw it with my flashlight. I looked closer and I think it might be a dangerous spider. Sorry for the bad quality, Thanks.
It has some red mark on its back if you cannot see clearly. Sorry for the poor quality image
Did it look like this? http://www.biosurvey.ou.edu/okwild/misc/amspider.html
If so, harmless.
Nope, I remember that the back was more of a bright red than orange.
The pattern is more important than the color, which can be variable...
It's two red triangles facing each other from the point kind of like one of those sand timer things