1 seed = 1 carrot.
I find that planting them in late August (here in Va Z-7) produces a much sweeter crop during late fall and winter. They store well in-ground during these cold months too.

vgkg - how do you get your seeds to germinate in the heat and humidity of late summer???

Usually one seed = one carrot. Not always, though; sometimes carrots will fork. It's technically still one, but it can look like several. Example, from my garden last year:

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ristau5741,

Dig a lower area like a recessed tray, sow the seeds, water, mulch and put a solid wooden board over that area just one or two inches above the soil level. In this case it would be the regular soil level since you went down a bit. This will keep them consistently moist enough to germinate in the heat of August. This is how I planted carrots last year in August when temps were 95-104F degrees so they'd be ready for a late fall showing of a public demonstration garden.

thank you so much...very helpful! I'm gonna try that and replant my carrot crop late august -k

ristau, Violet "covered" it her way :), but for me all I do is sow the seed thickly in wide raised rows and thin out the excess. The heat doesn't appear to deter germination but keeping the moisture even is important since carrots are very slow to germinate. The other headache is keeping the row weed free while the slow-to-start carrots are taking hold.

kkcusce, remember now that late August for me (Va Z-7) might be a different timing for your location? Aug 20th is my target date for all my fall crops (collards, kale, carrots, kholrabi, turnip seeds + broccoli & cabbage transplants), except for spinach seed whick I plant late Sept for an early spring harvest. Rule of thumb is planting about 7-8 weeks before first expected average frost date for your area.