Mammoth Spring, AR frost dates
Last spring frostApr 12median date
First fall frostOct 24median date
Growing season195 daysfrost-free
Hardiness zone7aZone 7a
How Mammoth Spring compares
- In 8 years out of 10, the last spring frost in Mammoth Spring falls between March 27 and April 27, a 31-day window. The first fall frost falls between October 11 and November 5.
- The median last frost is 15 days later than the Arkansas median of Mar 28.
- Its 195-day growing season is longer than 4% of the 603 Arkansas places with a regular frost season (state median 222 days).
- The last frost is 4 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 103 nights a year at or below 32°F.
- Compared with Jonesboro, AR, 102 km away, the last frost here is 20 days later than there and the growing season is 36 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 27 |
| 50% (median) | April 12 |
| 10% (safe for tender plants) | April 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 11 |
| 50% (median) | October 24 |
| 90% (late) | November 5 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Mammoth Spring, AR
Mammoth Spring, AR frost dates — last frost Apr 12, first frost Oct 24, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 18 to Feb 1Transplant outside: Mar 15 to Mar 29
Start indoors: Feb 1 to Feb 15Transplant outside: Apr 26 to May 10
Start indoors: Feb 1 to Feb 15Transplant outside: Apr 26 to May 10
Start indoors: Feb 15 to Mar 1Transplant outside: Apr 19 to May 3
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 22 to Apr 5Sow outdoors: Mar 15 to Apr 19Plant for fall: Aug 29 to Sep 26
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 15 to Mar 29Plant for fall: Aug 15 to Sep 5
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 29 to Apr 12Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 18 to Aug 8
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 29 to Apr 12Plant for fall: Jul 18 to Aug 8
Start indoors: Mar 1 to Mar 15Transplant outside: May 3 to May 17Sow outdoors: May 3 to May 17
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 19 to May 3
Sow outdoors: Mar 1 to Mar 22Plant for fall: Aug 1 to Aug 22
Sow outdoors: Mar 1 to Mar 22Plant for fall: Aug 29 to Sep 19
Sow outdoors: Mar 8 to Apr 19Plant for fall: Sep 12 to Oct 3
Start indoors: Mar 15 to Mar 22Transplant outside: Apr 26 to May 3Sow outdoors: Apr 19 to May 3Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 15 to Mar 22Sow outdoors: Apr 19 to May 3Plant for fall: Aug 15 to Aug 29
Start indoors: Mar 15 to Mar 22Sow outdoors: Apr 19 to May 3
Start indoors: Mar 15 to Mar 22Transplant outside: Apr 26 to May 10
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 1 to Aug 15
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 22 to Apr 12
Sow outdoors: Mar 29 to Apr 26Plant for fall: Aug 15 to Aug 29
Sow outdoors: Mar 29 to Apr 19Plant for fall: Aug 29 to Sep 19
Sow outdoors: Apr 19 to May 10Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 19 to May 3
Transplant outside: Apr 26 to May 17
Plant for fall: Oct 10 to Nov 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mammoth Spring, AR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 18 – Feb 1 | Mar 15 – Mar 29 | — | — |
| Peppers | Feb 1 – Feb 15 | Apr 26 – May 10 | — | — |
| Eggplant | Feb 1 – Feb 15 | Apr 26 – May 10 | — | — |
| Tomatoes | Feb 15 – Mar 1 | Apr 19 – May 3 | — | — |
| Lettuce | Feb 15 – Mar 1 | Mar 22 – Apr 5 | Mar 15 – Apr 19 | Aug 29 – Sep 26 |
| Kale | Feb 15 – Mar 1 | Mar 15 – Mar 29 | Mar 15 – Mar 29 | Aug 15 – Sep 5 |
| Broccoli | Feb 15 – Mar 1 | Mar 29 – Apr 12 | — | Jul 18 – Aug 8 |
| Cabbage | Feb 15 – Mar 1 | Mar 22 – Apr 5 | — | Jul 18 – Aug 8 |
| Cauliflower | Feb 15 – Mar 1 | Mar 29 – Apr 12 | — | Jul 18 – Aug 8 |
| Okra | Mar 1 – Mar 15 | May 3 – May 17 | May 3 – May 17 | — |
| Basil | Mar 1 – Mar 15 | Apr 19 – May 3 | — | — |
| Peas | — | — | Mar 1 – Mar 22 | Aug 1 – Aug 22 |
| Spinach | — | — | Mar 1 – Mar 22 | Aug 29 – Sep 19 |
| Radishes | — | — | Mar 8 – Apr 19 | Sep 12 – Oct 3 |
| Cucumbers | Mar 15 – Mar 22 | Apr 26 – May 3 | Apr 19 – May 3 | Aug 8 – Aug 22 |
| Zucchini & Summer Squash | Mar 15 – Mar 22 | — | Apr 19 – May 3 | Aug 15 – Aug 29 |
| Winter Squash & Pumpkins | Mar 15 – Mar 22 | — | Apr 19 – May 3 | — |
| Melons & Watermelon | Mar 15 – Mar 22 | Apr 26 – May 10 | — | — |
| Carrots | — | — | Mar 22 – Apr 19 | Aug 1 – Aug 15 |
| Beets | — | — | Mar 22 – Apr 19 | Aug 15 – Aug 29 |
| Potatoes | — | — | Mar 22 – Apr 12 | — |
| Swiss Chard | — | — | Mar 29 – Apr 26 | Aug 15 – Aug 29 |
| Cilantro | — | — | Mar 29 – Apr 19 | Aug 29 – Sep 19 |
| Green Beans | — | — | Apr 19 – May 10 | Aug 8 – Aug 22 |
| Sweet Corn | — | — | Apr 19 – May 3 | — |
| Sweet Potatoes | — | Apr 26 – May 17 | — | — |
| Garlic | — | — | — | Oct 10 – Nov 14 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Mammoth Spring, AR weather station, 10 km away (elevation 502 ft (153 m)).
Frost dates near Mammoth Spring
- Cherokee Village Apr 4 · Oct 31
- Camp Apr 8 · Oct 30
- Hardy Apr 4 · Oct 31
- Glencoe Apr 8 · Oct 30
- Ash Flat Apr 4 · Oct 31
- Williford Apr 4 · Oct 31
- Salem Apr 8 · Oct 30
- Horseshoe Bend Apr 8 · Oct 30
- Wiseman Apr 8 · Oct 30
- Sturkie Apr 8 · Oct 30
Frequently asked questions
When is the last frost in Mammoth Spring, AR?
The median last spring frost in Mammoth Spring, AR is April 12. There is still about a 10% chance of frost after April 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mammoth Spring, AR?
The median first fall frost is October 24, with about a 10% chance of frost before October 11.
How long is the growing season in Mammoth Spring, AR?
About 195 days between the median last spring frost and first fall frost.
What planting zone is Mammoth Spring, AR?
Mammoth Spring, AR is in USDA hardiness zone 7a.