Rainline GardenTri-Cities (Pasco, Kennewick, Richland), WA frost dates and planting calendar
The typical last spring frost in Tri-Cities (Pasco, Kennewick, Richland) is April 27, and the first fall frost is around October 11. Plant peas from Mar 20; plant tomatoes from May 1.
Columbia Basin and low eastern valleys. Hot, dry summers and quick spring warm-up. Warm crops go in earlier than west of the Cascades, and irrigation matters more than rain.
Frost dates are 1991–2020 NOAA climate normals for Pasco Tri-Cities Airport (124 m elevation). Gardens in cold hollows or at higher elevation can frost later in spring and earlier in fall.
What to plant now
Turn on JavaScript to see what's in season today. The full calendar is below.
New to gardening? Start with these 5 easy crops
They're forgiving, quick and hard to kill in Tri-Cities (Pasco, Kennewick, Richland). Tap one for planting dates and step-by-step instructions, or read the beginner's guide.
RadishesReady in about four weeks, so you see results fast.
LettuceGrows in cool weather and a bit of shade, and you can pick it for weeks.
Bush beansBig seeds that are easy to plant, and one sowing feeds you all summer.
Zucchini and summer squashTwo plants are plenty. It almost always produces.
KaleShrugs off Northwest cold and keeps going into winter.
Make a garden plan for Tri-Cities (Pasco, Kennewick, Richland) Pick your plants and get a dated, printable to-do list.
Planting calendar
- Start seeds indoors
- Plant in the garden
- Plant again for fall
- Frost possible
- Frost likely
How to read this: each bar shows when to do that job. Dashed bars are for starting seeds indoors in trays; solid bars are for planting in the garden.
Planting dates for Tri-Cities (Pasco, Kennewick, Richland)
| Crop | Start seeds indoors | Plant in the garden | Plant again for fall |
|---|---|---|---|
 PeasPlant seeds in the ground | — | Mar 20 – May 1 | — |
RadishesPlant seeds in the ground | — | Mar 20 – May 15 | Aug 30 – Sep 13 |
 SpinachPlant seeds in the ground | — | Mar 20 – Apr 24 | Aug 16 – Sep 6 |
LettucePlant seeds or young plants | Feb 6–20 | Mar 20 – May 15 | Aug 16–30 |
 OnionsPlant small onion bulbs (sets) | — | Mar 20 – Apr 24 | — |
 CarrotsPlant seeds in the ground | — | Apr 1 – May 27 | Jul 19 – Aug 2 |
 BeetsPlant seeds in the ground | — | Apr 1 – May 27 | Aug 2–16 |
KalePlant young plants (starts) | Feb 18 – Mar 4 | Apr 1 – May 13 | Aug 2–16 |
 BroccoliPlant young plants (starts) | Feb 11–25 | Apr 1 – May 6 | Jul 19 – Aug 2 |
 CabbagePlant young plants (starts) | Feb 11–25 | Apr 1 – May 6 | Jul 19 – Aug 2 |
 Swiss chardPlant seeds in the ground | — | Apr 1 – May 27 | Aug 2–16 |
 PotatoesPlant seed potatoes | — | Apr 1 – May 13 | — |
Bush beansPlant seeds in the ground | — | May 4 – Jun 15 Keep frost cover handy at first | — |
 Sweet cornPlant seeds in the ground | — | May 4 – Jun 8 Keep frost cover handy at first | — |
 CucumbersPlant seeds or young plants | Apr 3–10 | May 1–29 Keep frost cover handy at first | — |
Zucchini and summer squashPlant seeds or young plants | Apr 3–10 | May 1–29 Keep frost cover handy at first | — |
 Winter squash and pumpkinsPlant seeds or young plants | Apr 3–10 | May 1–22 Keep frost cover handy at first | — |
 TomatoesPlant young plants (starts) | Mar 6–20 | May 1–29 Keep frost cover handy at first | — |
 PeppersPlant young plants (starts) | Feb 20 – Mar 6 | May 1–22 Keep frost cover handy at first | — |
 BasilPlant young plants (starts) | Mar 20 – Apr 3 | May 1–29 Keep frost cover handy at first | — |
 DahliasPlant tubers | — | May 1–29 Keep frost cover handy at first | — |
 CilantroPlant seeds in the ground | — | Mar 20 – May 8 | Aug 23 – Sep 6 |
 ParsleyPlant seeds or young plants | Feb 4–18 | Apr 1 – May 20 | — |
 DillPlant seeds in the ground | — | Apr 1 – Jun 3 | — |
 StrawberriesPlant young plants | — | Apr 1 – May 13 | — |
 BlueberriesPlant potted or bare-root bushes | — | Apr 1 – May 20 | — |
 RaspberriesPlant bare-root canes | — | Apr 1 – May 13 | — |
 GarlicPlant cloves | — | — | Oct 1 – Nov 1 |
 CauliflowerPlant young plants (starts) | Feb 11–25 | Apr 1–29 | Jul 12–26 |
 Brussels sproutsPlant young plants (starts) | Feb 4–18 | Apr 1 – May 13 | — |
 LeeksPlant young plants (starts) | Jan 21 – Feb 4 | Apr 1 – May 13 | — |
 ArugulaPlant seeds in the ground | — | Mar 20 – May 1 | Aug 23 – Sep 13 |
 Bok choyPlant seeds or young plants | Feb 13–27 | Mar 20 – Apr 24 | Aug 16–30 |
 TurnipsPlant seeds in the ground | — | Mar 20 – May 1 | Aug 9–23 |
 KohlrabiPlant seeds or young plants | Feb 18 – Mar 4 | Apr 1 – May 13 | Aug 9–23 |
 EggplantPlant young plants (starts) | Feb 20 – Mar 6 | May 1–22 Keep frost cover handy at first | — |
 MelonsPlant seeds or young plants | Apr 3–10 | May 1–22 Keep frost cover handy at first | — |
 Pole beansPlant seeds in the ground | — | May 4 – Jun 8 Keep frost cover handy at first | — |
 Fava beansPlant seeds in the ground | — | Mar 20 – Apr 24 | — |
 ShallotsPlant bulbs | — | — | Oct 1 – Nov 1 |
 AsparagusPlant dormant crowns | — | Apr 1 – May 13 | — |
 RhubarbPlant dormant crowns | — | Mar 20 – May 1 | — |
 ChivesPlant seeds or young plants | Feb 4–18 | Apr 1 – May 27 | — |
 MintPlant young plants | — | Apr 1 – May 27 | — |
 RosemaryPlant young plants | — | Apr 1 – May 20 | — |
 ThymePlant young plants | — | Apr 1 – May 27 | — |
 OreganoPlant young plants | — | Apr 1 – May 27 | — |
 SunflowersPlant seeds in the ground | — | May 4 – Jun 15 Keep frost cover handy at first | — |
 Sweet peasPlant seeds in the ground | — | Mar 20 – Apr 24 | — |
 TulipsPlant bulbs | — | — | Oct 1 – Nov 1 |
 DaffodilsPlant bulbs | — | — | Oct 1 – Nov 1 |
Dates are a guide, not a guarantee. Check the soil before planting: cool-season crops need it workable and not soggy; warm-season crops need it warm. A $10 soil thermometer pays for itself. Unfamiliar terms are explained in the glossary.
Nearby areas with similar weather
All Oregon and Washington cities or use the planner with your ZIP.