The Kenya Meteorological Department (KMD) has released the March-April-May (MAM) 2026 rainfall onset outlook and the message is clear: rainfall will not start at the same time across the country.
For farmers, landscapers, gardeners, institutions and anyone managing land or green spaces, timing is everything. Plant too early and you risk seed loss. Prepare too late and you lose the first critical weeks of moisture.
This guide breaks down:
- What the 2026 rainfall onset map really means
- County-by-county onset expectations
- Practical preparation steps before the rains arrive
- Water-smart technologies every farmer should consider this season
- How Eden Lawn & Garden Centre supports you as a one-stop information and supply hub
Understanding the 2026 Rainfall Onset Map (MAM Season)
According to the Kenya Meteorological Department, rainfall onset for the MAM season will progress gradually from west to east and from the coast inland, rather than a nationwide start.
Rainfall Onset by Region
1. Areas Where Rains Continue from February
Counties include:
- Kisumu
- Siaya
- Homa Bay
- Migori
- Parts of Nandi, Kericho, Vihiga
What this means:
- These regions already have soil moisture
- Opportunity for early land preparation and transplanting
- Increased need for drainage management to avoid waterlogging
2. Second to Third Week of March
Counties include:
- Nakuru
- Laikipia
- Meru
- Parts of Nyandarua
Advice:
- Ideal window for dry planting
- Ensure seed, fertilizer, and irrigation backups are ready
- Livestock farmers should plan pasture regeneration
3. Third to Fourth Week of March
Counties include:
- Kitui
- Makueni
- Kajiado
- Taita Taveta
Key risk:
Rainfall may be erratic at the start.
Smart approach:
- Use water harvesting and storage
- Avoid broadcasting seed too early
- Focus on soil moisture conservation
4. Fourth Week of March to First Week of April
Counties include:
- Tana River
- Parts of Garissa
- Inland coastal hinterlands
Recommendation:
- Delay planting until two consistent rainfall events
- Prioritize drought-resilient crops
- Prepare irrigation as insurance
5. First to Second Week of April (Coastal Strip)
Counties include:
- Kwale
- Kilifi
- Lamu
What to expect:
- Humid conditions
- Risk of pest pressure once rains start
- Good conditions for horticulture if water is managed properly
6. Second to Third Week of April
Counties include:
- Turkana
- Marsabit
- Samburu
- Wajir
- Mandera
Critical insight:
These ASAL regions experience late and often short rainfall windows.
Action required:
- Maximize every millimeter of rain
- Invest in water capture, storage, and controlled irrigation
What Farmers & Gardeners Should Do Before the Rains
1. Soil Preparation Is Non-Negotiable
- Test soil where possible
- Incorporate organic matter
- Break compaction early
Healthy soil absorbs and retains moisture better — reducing water stress later.
2. Water Is the Real Currency This Season
Rainfall may come late or uneven. Smart farmers don’t rely on rain alone.
Essential Water-Saving Solutions:
- Drip irrigation systems – delivers water directly to roots, reduces wastage by up to 60%
- Dam liners (HDPE liners) – store harvested rainwater safely without seepage
- Water pumps (petrol, diesel, solar) – move water efficiently from rivers, tanks, or pans
- Water tanks & storage solutions – critical during rainfall gaps
💡 Even in high rainfall zones, controlled irrigation improves yields and consistency.
3. Plan Irrigation as Backup, Not Emergency
Many farmers only think of irrigation after crops start wilting. By then, losses have begun.
Instead:
- Install systems early
- Test pumps and pipes now
- Secure spare fittings and connectors
4. Landscape & Garden Managers: Timing Matters Too
For lawns, hedges, and ornamental plants:
- Avoid heavy planting before confirmed onset
- Prepare drainage to prevent root rot
- Service equipment (mowers, pumps, sprinklers) early
Key Products to Consider This Season
- Drip irrigation kits (small & large scale)
- Water pumps (petrol, diesel, solar)
- Dam liners & water storage solutions
- Sprinklers & irrigation fittings
- Soil preparation tools and equipment
(Our team can help size and select the right solution based on your location and rainfall timing.)
Final Word: Prepare Early, Not in Panic
The 2026 rainfall outlook is not a warning – it’s an opportunity to plan better.
Farmers who prepare:
- Plant on time
- Lose fewer crops
- Use less water
- Earn more consistently
Those who wait for the first heavy downpour often pay the price.
Stay informed. Prepare early.
And let Eden Lawn & Garden Centre be your partner this season.
