Kale is cold hardy and so is spinach. I do start kale in pots mainly because I only need a couple of plants. I soak the spinach seeds overnight to speed germination and I direct sow.
Spinach can germinate in 45-65 degrees, so you should be able to sow soon.
Chard can be planted 2-3 weeks before the last frost date. For zone 7 Maryland that is April 15, so you should be good to start all of your seeds now. Chard is cut and come again so I only need a few plants so I sow the seeds in pots and transplant them out. Since chard can tolerate warmer conditions, succession plantings can be made to extend the harvest.
Happy gardening in Hawaii. Gardens are where people grow.