Carrots are an Autumn crop which must be purchased from the General Store. They sell for 120 G each in a Shipment Box and therefore 1080 G per harvest of 9 crops.
While vanilla carrots will spawn in the world (say in a village) you cannot harvest them. There is a bug where you can still plant them the normal way, but once again you cannot harvest them. Instead you need to purchase seeds from the general store and grow them.
It is possible to get 780 G profit per harvest, and assuming crops are replanted as soon as they are harvested, up to 3240 G (2340 G profit) can be obtained each season.
NPCs
Abii • Ashlee •Brandon •Candice •Cloe •Danieru •Fenn •Granny Katlin •Jade •Jakob •Jenni •Jim •Johan •Liara •Mayor Jeimmi •Tiberius •Tomas •Yulif •Harvest Goddess
Buildings
Animal Ranch •Cafe •Carpenter's Hut •Church •Clockmaker •Fishing Hole •Fishing Hut •General Store •Goddess Pond •Mining Hill •Mining Hut •Poultry Farm •The Blacksmith •Townhall
Crops
Beetroot Cabbage Carrot Corn Cucumber Eggplant Grass Green Pepper •Industrial Hemp Hardy Turnip Onion Pineapple Potato Pumpkin Spinach Strawberry Sweet Potato Tomato Turnip Watermelon Wheat
Animals
Chicken Cow Sheep Animal Fodder Animal Medicine Chicken Feed Chicken Treat Cow Treat Egg Feeding Tray Food Trough Incubator Milk Miracle Potion Nest Box Sheep Treat Treat Wool
Tools
Cooking