Divisi
When to plant Sorghum in Isiolo South
Isiolo, Kenya
Known here as mtama
Sorghum (Sorghum bicolor — mapfunde, mtama, amabele, mapira, dawa, mashilla) is the toughest of the grain cereals: a tall, C4 grass that keeps standing and yields when heat and dry spells have already beaten maize.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 16 Sep 2026 – 16 Oct 2026 open now | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | 2.9–3.6 t/ha | about 5.0 t/ha |
| Harvest | From 15 Dec 2026 to 5 Mar 2027, depending on the planting date | |
| Ready to harvest | 90–140 days after planting | |
| Work it takes | 92–168 days per hectare, by hand | |
| Rain meets its needs | 92% | |
Rain-fed. These dates are worked out from each place's own rainfall, for a field watered by the season — with irrigation a window can open earlier, close later, or come round more than once a year. Check your own field under What grows, or get the Divisi app for a calendar dated to your farm.
If you only get one chance to plant, aim for around 26 Sep 2026. That is the point in the window where the rains are most reliably established.
This season's outlook for Isiolo South leans wet. Plant at the early end of the window, and make sure water can drain off the field — a wet year does more damage through waterlogging than through the rain itself.
Planting after 16 Oct 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Isiolo South
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 88% |
For sorghum in Isiolo South, the lie of the land is the tightest of the three at 88%. You cannot flatten it, but you can farm it: plant along the contour rather than up and down, ridge or tie ridges to hold water on the slope, and expect shallower rooting than the crop would manage on flat ground.
The 2026 season in Isiolo South
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | October 2026 to December 2026 |
| Rain in a typical year | About 346 mm |
| This season's rain | Leaning wet — October, November and December look heavier than usual. Make sure water can drain off the field; a wet year does more damage through waterlogging and disease than through the rain itself. |
| This season's heat | Hotter than usual — about +0.8 °C over the growing months. Heat makes the same rain do less, so a dry spell bites sooner: do not plant late, and shade or mulch what you can. |
| What that supports | enough rain for one short crop, and only if timed to it, warm all year, so nothing but rain ends the season |
| Ground this covers | 3 kinds of ground. The season below is the largest that farms — about 41% of this area. |
| 54% | too dry for rain-fed cropping without irrigation; warm all year, so nothing but rain ends the season no rain-fed season · about 280 mm |
|---|---|
| 41% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 98 growing days · about 380 mm · October to December |
| 3% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 140 growing days · about 530 mm · October to January |
last updated 30 September 2026
Frost and pest pressure hold back about 15% of yield here.
What sorghum needs to grow here
| Soil it likes | sandy loam, loam, clay loam or clay |
|---|---|
| Soil sourness (pH) | Happiest between pH 6.0 and 7.5 |
| Rain it needs | About 450–650 mm across the season |
| Spacing | 70 cm between rows, 15 cm between plants |
| Feed it most with | nitrogen, phosphorus, zinc and sulphur |
What it takes to grow sorghum in Isiolo South
| Planting material | About 100,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 15 kg per hectare |
| Phosphate (P₂O₅) | About 6 kg per hectare |
| Potash (K₂O) | About 17 kg per hectare |
| In the shops | A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. A nitrogen top dressing — urea or AN — goes on once the crop is established. |
| Hand work | 92–168 days per hectare, by hand |
These are the nutrients a sorghum crop of that size carries off the field. What you actually apply depends on what your soil already holds — which is what a soil test, or the app's field records, tell you.
What to watch for
Grow Sorghum with a plan, not a guess
Everything above describes Isiolo South as a whole — your own soil, slope and rainfall will shift the dates. The Divisi app works them out for your field, and dates each job that follows.
Sorghum in nearby districts
This calendar moves
Planting windows shift with the forecast. Leave your email and we'll send what changed, and a note when planting time nears — a couple of emails a month at most.
Frequently asked questions
Will sorghum grow well in Isiolo South?
Isiolo South rates as favourable for sorghum.
When should I plant sorghum in Isiolo South?
Typically 16 Sep 2026 to 16 Oct 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Isiolo South, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
