Planning polyhouse farming in Kishanganj? Kishanganj is a mid-sized city in Kishanganj district, Bihar, home to about 1.1 lakh people (GeoNames)[1][2], about 390 km from Kolkata. Below we use the town's monthly temperatures, humidity and rainfall to work out which structure fits, which crops to grow and in which months, before you spend on construction.
Climate for polyhouse farming in Kishanganj
April is the hottest month in Kishanganj, with average daily highs of about 37°C. January has the coolest nights, averaging 9°C.[3] The area gets about 1,701 mm of rain a year, most of it in May to October, peaking in July at about 427 mm. Average humidity stays at 75% or more in July to November, which raises the risk of leaf disease and slows evaporative cooling. Kishanganj sits about 41 m above sea level.[2] On the Köppen–Geiger climate map, Kishanganj falls in the humid subtropical with dry winters zone (Cwa).[4]
Kishanganj climate by month
Month
Avg high (°C)
Avg low (°C)
Humidity (%)
Rain (mm)
Jan
22.8
8.9
58
6
Feb
27.7
12.3
47
10
Mar
33.7
17.4
37
26
Apr
37.3
22.5
42
72
May
36.9
25.3
57
164
Jun
34.8
26.5
73
271
Jul
31.8
26.1
86
427
Aug
31.5
25.8
87
324
Sep
30.6
24.6
88
288
Oct
29.2
20.8
82
106
Nov
26.3
15.4
75
5
Dec
23.1
10.8
69
2
Area averages (a grid cell of about 50 km) for 2001–2025, from NASA POWER, centred on Kishanganj. Rainfall and night temperatures at your plot can differ, especially near hills and the coast.[3]
Advantages of protected cultivation in Kishanganj
1
Year-round crops
Under cover, capsicum can be grown for 10 months a year in Kishanganj, so you can supply buyers every week instead of one open-field season.
2
Better yield and price
Plants grow without rain, hail and wind damage, so yields are higher and more even, and clean, graded produce sells at a better price, especially off-season.
3
Less water
Drip irrigation under cover uses less water than flood irrigation, and the roof keeps July's 427 mm of rain off the crop and the soil.
4
Less pesticides
Insect net on vents and doors keeps out most pests, and controlled ventilation helps with leaf disease in the humid months (July to November), so you spray less often.
5
Subsidy eligible
Polyhouse, shade net and nethouse projects in Bihar can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department.[5]
Which polyhouse suits Kishanganj?
For polyhouse farming in Kishanganj, the structure decides which months you can crop and what it costs to run. Average highs stay at 33°C or more in March to June, with moderate humidity of about 52%. In that dry air, wet pads can bring a 37°C April afternoon down to roughly 29°C inside a Fan & Pad polyhouse, cool enough for lettuce and other leafy greens. Capsicum, cucumber and tomato do well in a naturally ventilated polyhouse with a shade screen. If you want one structure, decide by crop: greens all year point to Fan & Pad; vine crops point to a naturally ventilated house.
Plan for heavy rain in July (about 427 mm): raise the plinth, size the gutters for that month and keep drains away from the nutrient tank. A nethouse, the lowest-cost option, can grow hardy crops in February to March and November, when it is mild and fairly dry.
Crops for Kishanganj
Based on Kishanganj's climate, the crops with the longest growing windows are capsicum (10 months), chilli pepper (10 months) and cucumber (9 months). Capsicum fits February to November with Fan & Pad cooling. These are the crops we would plan first for polyhouse farming in Kishanganj.
Months each crop suits in Kishanganj
Crop
Naturally ventilated polyhouse
With Fan & Pad cooling
Capsicum
Feb and Sep–Nov
Feb–Nov
Tomato
Feb and Sep–Dec
Feb–May and Sep–Dec
Cucumber
Mar and Jul–Nov
Mar–Nov
Chilli pepper
Feb and Jul–Nov
Feb–Nov
Brinjal
Jul–Nov
Mar–Nov
Lettuce
Nov–Feb
Oct–Apr
Broccoli
Dec–Jan
Nov–Mar
Strawberry
Dec–Jan
Nov–Feb
Rose
Feb and Nov–Dec
Feb–Mar and Oct–Dec
Gerbera
Feb and Nov–Dec
Feb–Apr and Oct–Dec
Carnation
Dec–Jan
Nov–Mar
Chrysanthemum
Feb and Nov–Dec
Feb–Mar and Oct–Dec
Anthurium
Oct
Mar–May and Jul–Oct
Orchids
Oct
Mar–May and Jul–Oct
Lilium
Dec–Jan
Nov–Mar
Kryzen planning estimate from the monthly averages above and each crop's usual day and night temperature range. Variety, soil or substrate temperature and shading change the result, so confirm with a trial.
₹5,165Spending per person per month, urban Bihar, 2023–24[6]
390 kmto Kolkata, the nearest metro (straight line)
Urban households in Bihar spent an average of ₹5,165 per person per month in 2023–24, below the all-India urban average of ₹7,078.[6] Local demand in Kishanganj may be small for exotic greens, so plan where the rest of the harvest goes. Purnia, about 60 km away, is the nearest larger market on our list.
Polyhouse farming in Kishanganj with Kryzen
We have built 2 projects in Bihar so far (see our project map (opens in a new tab)). Kishanganj is about 1,460 km in a straight line from our Chhatrapati Sambhajinagar warehouse, our nearest site.
Towns near Kishanganj
We also plan and build farms in these towns near Kishanganj:
Map: LGD 2024 boundaries via bharatlas, CC BY 4.0. For illustration only.
Polyhouse farming in Kishanganj: FAQs
Can a polyhouse farm run all year in Kishanganj?
Yes, with the right structure. For Kishanganj we would plan Fan & Pad cooling for leafy greens and a naturally ventilated polyhouse for vine crops. Even then, lettuce is hard to grow in May to September, so plan another crop for those months.
Which polyhouse is best for Kishanganj?
With April highs of about 37°C and 42% average humidity in that month, we would start with Fan & Pad cooling for leafy greens and a naturally ventilated polyhouse for vine crops.
Which crops should I grow in a polyhouse in Kishanganj?
Going by the monthly climate, capsicum, chilli pepper and cucumber have the longest growing windows. Confirm prices and volumes with buyers before you plant.
Is polyhouse farming profitable in Kishanganj?
It can be, if the crop, the structure and the buyers match. In Kishanganj, capsicum and chilli pepper have the longest seasons under cover. Confirm prices and volumes with buyers first; our Detailed Project Report works out the cost, yield and returns for your plot.
Does Kryzen build polyhouses in Kishanganj?
Yes. Our nearest site is our Chhatrapati Sambhajinagar warehouse, about 1,460 km away, and we have built 2 projects in Bihar.
Is there a subsidy for polyhouse or hydroponic farms in Bihar?
Yes. Protected cultivation projects in Bihar can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department. Check the current rate and area limit when you apply.
Discuss your Kishanganj farm project
Share your plot location, water test and crop targets. We will suggest the right structure and growing system, and send an itemised quotation.
A computer engineer turned hydroponic farmer from a multigenerational farming family in Satara. Sudhir founded Kryzen in 2019, and the team has since built 350+ protected and hydroponic farms across India.
