Beets can be grown in the spring or the fall with success. Timing is everything!
Outdoor Sowing Tips:  1) While beet seeds will germinate in soil temperature between 50 and 75°F, they love the cooler weather for growing. 2) Before sowing, loosen or fluff the soil. 3) Beet seeds should be sowed about 1/2″ deep. 4) Most beets seedlings should be 3 to 4″ apart or 16 per square foot for small beets or 9 per square feet for large beets.
I typically start sowing beet seeds in early spring outside under cover. Small beets are great candidates for succession crops and interplanting.
Indoor Sowing Tips:  1) Since root crops don’t like their roots disturbed, I would NOT start them indoors to move them outside. 2) However, you can grow small beets inside under grow lights. You just need to make sure your pot is deep enough so the beets don’t dry out. The root on large beets can be quite long. 3) and 4) – see above.
Growing Tips: 5)  Start thinning when the beets form two true leaves. When thinning, do not pull the other seedlings out, just cut them at the soil line to stop them from growing. Don’t forget the seedlings that you snip are great microgreens! 6) Beets love consistent moisture so I use a drip system. 7) If needed, I would feed beets used coffee grinds or some bone meal which are good for root growth.  8) If you put beets under cover or add leaf mulch, you can achieve a longer growing period and protect the roots from any drastic temperature changes.
Sowing and growing beets is similar to sowing and growing radishes.
