Francesca,

I sowed mine indoors last week. I plan to wait until it cools off a bit before placing the containers in a shady spot outside, until space becomes available in the garden. It's probably too hot to get good germination with direct sowing, and if you plant it out when it's this hot, it may bolt.

See recent thread on same topic.

Bonnie

Here is a link that might be useful: When to plant fall lettuce?

I put together some general planting season info for Colorado at the page linked below. It's not perfect, but you might find it useful.

Here is a link that might be useful: Colorado Planting Dates