Colorado only has two poisonous
spiders. Luckily these spiders tend to avoid bright, wet areas, so
your garden is not an ideal location for these guys to set up their
Black Widows live in dark, cool places and hunt
their prey there. The bright red hourglass on their underside helps
to identify these dangerous arachnids.
Brown Recluse Spiders have also been found
in Colorado, and live in similar conditions as Black Widows. You can
tell them apart from other spiders by the violin shaped marking on
their back, just behind their head.
These spiders are commonly found in wood piles,
corners of garages, crawl spaces, window wells, and similar