Gardening in Kansas City, MO-KS
This metro spans USDA zones 6a to 7a, so there is no single zone for Kansas City, MO-KS and anyone who gives you one is rounding. 75% of its ZIP codes are zone 6b; the rest are not.
Which zone you are in depends where you are
Kansas City, MO-KS covers 3 hardiness zones. A guide that gives the metro one zone has picked whichever is largest and rounded everyone else into it — which is fine for the 75% in zone 6b and wrong for the other 25%. Here is the actual split.
| Zone | ZIP codes | Share | |
|---|---|---|---|
| 6b | 151 | 75% | |
| 6a | 44 | 22% | |
| 7a | 7 | 3% |
Zones are published per ZIP code, so yours is exact even though the metro's is not. The hardiness tool will tell you which one you are in.
Your freeze dates
Those are the earliest and latest medians among the 30 stations serving this metro — not an average, and not one station standing in for the rest. Half of years freeze later than a station's own median.
The spread is the point. Even in a metro that is one hardiness zone throughout, its stations disagree about the last spring freeze. Hardiness zone and frost date measure different things — a zone is the average annual coldest night, a freeze date is when the season turns — and a place can be uniform in one and varied in the other. Use the tools below with your own ZIP rather than the ends of this range.
Your growing season
NOAA publishes a growing-season length for each station, and across the 30 stations serving Kansas City, MO-KS it runs 175–211 days . That figure is published, not computed from the two freeze dates — subtracting one from the other gives the wrong answer wherever a season crosses New Year. Mean summer high (June–August) runs 84–89 °F , below the 90 °F point where cool-season crops reliably bolt.
When to start seeds in Kansas City, MO-KS
Every spring job for 63 crop dates, counted from this metro's own last spring freeze. Each is a range across all 30 stations — the earliest and latest that job falls anywhere in the metro — because no one station speaks for the whole area.
| Crop | Job | When | Offset |
|---|---|---|---|
| Green Onions | Start indoors | February 7 – February 26 | 8 weeks before |
| Peppers | Start indoors | February 7 – February 26 | 8 weeks before |
| Broccoli | Start indoors | February 21 – March 12 | 6 weeks before |
| Cabbage | Start indoors | February 21 – March 12 | 6 weeks before |
| Collards | Start indoors | February 21 – March 12 | 6 weeks before |
| Kale | Start indoors | February 21 – March 12 | 6 weeks before |
| Leaf Lettuce | Start indoors | February 21 – March 12 | 6 weeks before |
| Peas | Direct sow | February 21 – March 12 | 6 weeks before |
| Spinach | Direct sow | February 21 – March 12 | 6 weeks before |
| Sweet Potato | Start indoors | February 21 – March 12 | 6 weeks before |
| Tomatoes | Start indoors | February 21 – March 12 | 6 weeks before |
| Bok Choy | Start indoors | February 28 – March 19 | 5 weeks before |
| Kohlrabi | Start indoors | February 28 – March 19 | 5 weeks before |
| Swiss Chard | Start indoors | February 28 – March 19 | 5 weeks before |
| Arugula | Direct sow | March 7 – March 26 | 4 weeks before |
| Baby Salad Greens | Direct sow | March 7 – March 26 | 4 weeks before |
| Beets | Direct sow | March 7 – March 26 | 4 weeks before |
| Green Onions | Direct sow | March 7 – March 26 | 4 weeks before |
| Mustard Greens | Direct sow | March 7 – March 26 | 4 weeks before |
| Okra | Start indoors | March 7 – March 26 | 4 weeks before |
| Radishes | Direct sow | March 7 – March 26 | 4 weeks before |
| Turnips | Direct sow | March 7 – March 26 | 4 weeks before |
| Cabbage | Set out | March 14 – April 2 | 3 weeks before |
| Carrots | Direct sow | March 14 – April 2 | 3 weeks before |
| Collards | Direct sow | March 14 – April 2 | 3 weeks before |
| Collards | Set out | March 14 – April 2 | 3 weeks before |
| Cucumbers | Start indoors | March 14 – April 2 | 3 weeks before |
| Green Onions | Set out | March 14 – April 2 | 3 weeks before |
| Kale | Direct sow | March 14 – April 2 | 3 weeks before |
| Kale | Set out | March 14 – April 2 | 3 weeks before |
| Kohlrabi | Direct sow | March 14 – April 2 | 3 weeks before |
| Kohlrabi | Set out | March 14 – April 2 | 3 weeks before |
| Leaf Lettuce | Direct sow | March 14 – April 2 | 3 weeks before |
| Pumpkins | Start indoors | March 14 – April 2 | 3 weeks before |
| Summer Squash | Start indoors | March 14 – April 2 | 3 weeks before |
| Winter Squash | Start indoors | March 14 – April 2 | 3 weeks before |
| Zucchini | Start indoors | March 14 – April 2 | 3 weeks before |
| Bok Choy | Direct sow | March 21 – April 9 | 2 weeks before |
| Bok Choy | Set out | March 21 – April 9 | 2 weeks before |
| Broccoli | Set out | March 21 – April 9 | 2 weeks before |
| Cilantro | Direct sow | March 21 – April 9 | 2 weeks before |
| Leaf Lettuce | Set out | March 21 – April 9 | 2 weeks before |
| Swiss Chard | Direct sow | March 21 – April 9 | 2 weeks before |
| Swiss Chard | Set out | March 21 – April 9 | 2 weeks before |
| Dill | Direct sow | March 28 – April 16 | 1 week before |
| Bush Beans | Direct sow | April 11 – April 30 | 1 week after |
| Cucumbers | Set out | April 11 – April 30 | 1 week after |
| Pumpkins | Direct sow | April 11 – April 30 | 1 week after |
| Pumpkins | Set out | April 11 – April 30 | 1 week after |
| Summer Squash | Direct sow | April 11 – April 30 | 1 week after |
| Summer Squash | Set out | April 11 – April 30 | 1 week after |
| Sweet Corn | Direct sow | April 11 – April 30 | 1 week after |
| Tomatoes | Set out | April 11 – April 30 | 1 week after |
| Winter Squash | Direct sow | April 11 – April 30 | 1 week after |
| Winter Squash | Set out | April 11 – April 30 | 1 week after |
| Zucchini | Direct sow | April 11 – April 30 | 1 week after |
| Zucchini | Set out | April 11 – April 30 | 1 week after |
| Cucumbers | Direct sow | April 18 – May 7 | 2 weeks after |
| Okra | Direct sow | April 18 – May 7 | 2 weeks after |
| Okra | Set out | April 18 – May 7 | 2 weeks after |
| Peppers | Set out | April 18 – May 7 | 2 weeks after |
| Southern Peas | Direct sow | April 18 – May 7 | 2 weeks after |
| Sweet Potato | Set out | April 18 – May 7 | 2 weeks after |
The week offsets are conventional extension guidance and vary by variety; the freeze dates they are counted from are measured. For a single date rather than a range, run when do I start my seeds? with your own ZIP code.
What survives the winter changes across Kansas City, MO-KS
Of 74 perennial fruits, nuts, berries, vegetables and herbs, 58 come through the winter in zone 7a and only 51 in zone 6a. That is a different garden at each end of the same metro.
| Zone | ZIPs | Survive | Fail for being too warm |
|---|---|---|---|
| 6a | 44 | 51 of 74 | 0 |
| 6b | 151 | 51 of 74 | 0 |
| 7a | 7 | 58 of 74 | 1 |
The last column is the counterintuitive one, and it is why the totals do not simply rise as the winters get milder. Most temperate fruit needs a documented number of hours below about 45 °F to break dormancy and set a crop, so an apple fails in a winter that is too warm; currants and rhubarb cook in the summer heat that comes with it. See the full list with reasons.
The 30 stations behind these numbers
Every figure above comes from these, and each is named so you can check it. Distances vary by ZIP code, so the tools report yours rather than this page guessing.
| Station | NOAA ID | Last spring freeze | First fall freeze | Season |
|---|---|---|---|---|
| Bonner Springs, KS | USC00140957 | April 16 | October 22 | 188 days |
| Butler 4W, MO | USC00231145 | April 12 | October 23 | 192 days |
| Cameron, MO | USC00231216 | April 15 | October 24 | 192 days |
| Clinton, MO | USC00231711 | April 17 | October 21 | 187 days |
| Cosby 2W, MO | USC00231924 | April 17 | October 19 | 184 days |
| Elm, MO | USC00232568 | April 13 | October 23 | 191 days |
| Hamilton 2W, MO | USC00233568 | April 23 | October 17 | 175 days |
| Higginsville, MO | USC00233838 | April 10 | October 24 | 195 days |
| Hillsdale Lake, KS | USC00143686 | April 9 | October 31 | 204 days |
| Independence, MO | USC00234154 | April 10 | October 27 | 198 days |
| Kansas City Downtown AP, MO | USW00013988 | April 4 | November 2 | 211 days |
| Kansas City INTL AP, MO | USW00003947 | April 13 | October 24 | 193 days |
| Kearney 3E, MO | USC00234382 | April 19 | October 17 | 181 days |
| Lawrence Muni AP, KS | USW00003997 | April 21 | October 17 | 177 days |
| Leavenworth 3Sw, KS | USC00144589 | April 19 | October 19 | 181 days |
| Leavenworth, KS | USC00144588 | April 12 | October 27 | 196 days |
| Lees Summit Muni AP, MO | USW00053879 | April 7 | October 29 | 202 days |
| Lees Summit Reed Wr, MO | USC00234850 | April 13 | October 26 | 194 days |
| Lexington 3E, MO | USC00234904 | April 8 | October 25 | 197 days |
| Mound City 1Ssw, KS | USC00145530 | April 15 | October 22 | 188 days |
| Mound City, KS | USC00145528 | April 13 | October 23 | 192 days |
| Olathe 3E, KS | USC00145972 | April 10 | October 29 | 202 days |
| Olathe Johnson Co AP, KS | USW00093909 | April 13 | October 24 | 193 days |
| Olathe Johnson Co Exec AP, KS | USW00003967 | April 8 | October 29 | 204 days |
| Osawatomie, KS | USC00146084 | April 14 | October 25 | 192 days |
| Paola, KS | USC00146209 | April 13 | October 21 | 191 days |
| Pleasant Hill Wfo, MO | USC00236745 | April 8 | October 29 | 204 days |
| Richmond 3S, MO | USC00237116 | April 19 | October 18 | 180 days |
| Smithville Lake, MO | USC00237862 | April 18 | October 20 | 183 days |
| Waverly, MO | USC00238770 | April 6 | October 30 | 207 days |
These are medians, not averages — NOAA publishes freeze dates as a probability distribution, and half of years freeze later than the date shown.
Work out your own dates
Each of these takes a ZIP code and answers for that ZIP alone, citing the station it used and how far away it is. There is a ZIP box in the header of every page.
- What survives my winter?
Runs on the hardiness zone, so it answers for all of Kansas City, MO-KS at once — zone across 74 perennial fruits, berries, vegetables and herbs.
- When do I start my seeds?
Dates every spring job from your own last freeze — sow indoors, set out, direct sow.
- When do I sow the next round?
How often each crop is worth re-sowing, and when the next sowing is due.
- What can I still plant?
Counts the growing days left before your first fall freeze, crop by crop.
Where these numbers come from
The hardiness zone is the USDA 2023 Plant Hardiness Zone Map, published per ZIP code by PRISM at Oregon State. The freeze dates are NOAA's 1991–2020 Climate Normals, read from every station whose normals cover a ZIP code in this metro. Nothing here is estimated, and no station stands in for another.
This page names no single station on purpose. Picking one to represent a metro sounds reasonable and is not: the station serving the most ZIP codes is an artifact of where ZIP centroids happen to fall, and it selects a lock on the Monongahela for Pittsburgh and a far southern suburb for Chicago. A range across every station is true; a single cited date for a whole metro is not.