Many gardeners in the Chicago area tend to plant their cool-weather crops too late and warm-weather crops too early. Things like onion sets, peas and spinach really need to be in the ground by mid-April and can be planted in late March if the soil is workable. I planted onion sets, snow peas, sugar snap peas, seven-tops turnips, curly mustard and the first planting of spinach the first weekend in April because the soil wasn't dry enough until then. Radishes and the first planting of arugula and lettuce went in the next week. The second plantings of spinach and lettuce went in about two weeks after the first plantings.
I need to go out soon to pick small turnip and mustard greens for dinner. Cooked lightly they will go well with the chicken cooked over charcoal with a little fruitwood. Pea trellis needs to go up in the next day or two, or I will have trouble getting it between the two closely spaced rows. Peas love cool, sunny weather.
I grow my own tomato, pepper and eggplant plants. Now they are in the basement on a bed of sand with heating cables and full-spectrum fluorescent lights. The lights are on chains, so the can be raised as the plants grow. If the weather forecasts are accurate, these plants will go out for a short time this weekend. These plants will go in and out according to weather for hardening. My wife refers to this process as taking them out for a walk. After May 15 I will review soil temperature and five-day forecast. May 15 represents the 95 percent chance for past last frost for much of the Chicago area. However, night-time temperatures are often too cold for good growth then. In Lincoln Square, as with most of the North Side, we are less likely to have a late frost but more likely to have excessively cool air and soil temperatures than farther inland. You really have to pay attention to local conditions. The calendar is a rough guide, but you need to observe carefully. Temperature and soil condition are monitored by feel rather than formula. In many ways it is like baking bread or making pie crusts.
Basil needs to go out somewhat later than tomatoes, which are tougher then eggplant. Basil is very sensitive to temperature below 40 degrees F and is rather short on flavor until temperatures get up into the 80s a lot. My standard here is Genovese compacta basil, which has more flavor in thinnings while being started in a cold basement than most supermarket basil. If you think supermarket basil is good, you have my sympathy but won't understand what I am talking about.
I will probably say more later, but now I need to get the grill set up and start harvesting.