Tomato plants need night temperature above 32°F and daytime temperatures above 60°F. They are readily killed by a light frost.
A week of cool daytime temperatures (below 55°F) will stunt plants, reducing yields.
With these warm temperature requirements, planting time along the Colorado Front Range is typically late May.
Do not plant tomatoes out into a cold spell and make sure soil temperatures are warm.
Seed sowing in the plains is done thrice during the year.
1) For rainy-autumn crop. The seeds are sown in the months of June and July while transplanting is done in the months of July and August.
2) For autumn-winter crop the seeds are sown in the months of September-October while transplanting is done in the months of October and November.
3) For spring-summer crop the seeds are sown in the months of January-February and transplanting is done in the months of February and March.
In hills the seed sowing depends upon the elevation of the place. On lower hills the seeds are sown in February-March while on higher hills in the months of March and April.
Tomato farming is very simple.
Anyone can do it in any capacity, either in the backyard or in commercial quantity.
Tomato can be grown round the year, especially in places where there is irrigation system specifically made for it.
In other places, it is best cultivated during the rainy season.