trs23 wrote:Is it safe to direct sow lettuce in the earthbox now?
We just received 5 on friday and I'm dying to give them a try. We were going to try one with romaine / spinach and I was hoping it would be ok.
We're newbies so please go easy on us!

I take it you received 5 types of seed?
I think it's dependent on a lot of things. First, part of the city are actually a different zone (5B) than the suburbs (5A), so it depends on where you are. Here is a
zone map. Also, it depends on if you have protection you can use in case it gets really cold. Also, the EarthBox soil temp may be warmer than the ground (even if left to overwinter) because it isn't surrounded by a lot of other cold ground. On the other hand, it is probably more affected by temperature changes.
A
frost chart is helpful to determine dates.
Here is some
general inforelated to when to plan different things.
I've read conflicting info about when to direct sow lettuce. The conservative approach would be 2 weeks before your frost free data (the frost free date is May 15th in the city, so that would be May 1). But, some information suggests you can plant as early as 6 weeks, which would be April 1.
Most packets of lettuce come with lots of seeds. You could always try a small section of a row now and then try the next section in 3 weeks and see what happens.
If you have a way to protect the lettuce - row cover, cold frame, even a blanket - then you might be fine with earlier. I have a cover I can put over them in case it looks like it will get below 31. Lettuce does prefer well drained soil and doesn't like being soggy, so take that into account, too.
I chose to sow inside on April 1 or thereabouts. Before I move them out, I have to "harden" them - which simply means to get them used to being in the cooler temps and the direct sun. Usually you start by putting them outside in the shade for short time, then in partial sun for a short time, then sun, etc. until they can tolerate being out all day and night.
I will move mine out for good around April 25 or so, at which time I'll direct sow some outside. I'll direct sow again on about May 15th. By early to mid July, unless I can move this to a shady spot (which I'm not sure I have), I'll harvest all the lettuce and plant something else.
Here's a
good article on lettuce.