In the garden now (2 November 2026)
Boise planting calendar
Bars show when each crop can go in and when a planting from that window is ready. The blue band is the frost season, from the average first autumn frost to the average last spring frost. Hover or tap a crop for details.
Sow indoorsSow or plant outdoorsHarvestFrost seasonToday
Swipe sideways to see the whole year →
Dates by crop
| Crop | Sow indoors | Sow / plant outdoors | Harvest |
|---|---|---|---|
| Tomato | Mar 27 – May 1 | May 22 – Aug 2 plant out | Jul 23 – Oct 14 |
| Pepper | Mar 26 – Apr 30 | Jun 4 – Jul 30 plant out | Aug 2 – Oct 14 |
| Eggplant (aubergine) | Apr 1 – May 6 | Jun 10 – Jul 26 plant out | Aug 9 – Oct 14 |
| Cucumber | May 1 – May 28 | May 29 – Aug 13 sow | Jul 16 – Oct 14 |
| Zucchini (courgette) | Apr 24 – May 21 | May 22 – Aug 16 sow | Jul 9 – Oct 14 |
| Pumpkin and winter squash | Apr 24 – May 21 | May 22 – Jul 14 sow | Aug 13 – Oct 20 |
| Watermelon | May 13 – Jun 9 | Jun 10 – Jul 25 sow | Aug 13 – Oct 14 |
| Sweet corn | – | May 7 – Jul 28 sow | Jul 25 – Oct 14 |
| Green beans | – | May 22 – Jun 25, Jul 13 – Aug 13 sow | Jul 13 – Oct 14 |
| Peas | – | Mar 13 – Apr 15 sow | Jun 9 – Jul 16 |
| Lettuce | Feb 20 – Mar 20 | Mar 27 – May 6, Aug 31 – Sep 7 sow | Jun 1 – Jul 16, Oct 14 – Oct 31 |
| Spinach | – | Mar 13 – May 2 sow | May 23 – Jul 10 |
| Kale | Feb 6 – Mar 13 | Mar 20 – May 23, Aug 26 – Sep 2 sow | Jun 7 – Sep 16, Oct 19 – Dec 5 |
| Cabbage | Feb 6 – Mar 13 | Mar 27 – Apr 26 plant out | Jun 20 – Jul 29 |
| Broccoli | Feb 13 – Mar 20 | Apr 3 – May 6 plant out | Jun 15 – Jul 27 |
| Carrots | – | Apr 3 – May 29 sow | Jun 18 – Sep 14 |
| Beets (beetroot) | – | Apr 3 – Jun 5, Aug 26 – Sep 2 sow | Jun 11 – Aug 30, Oct 19 – Nov 11 |
| Radishes | – | Mar 20 – May 23, Sep 9 – Sep 25 sow | May 8 – Jun 28, Oct 3 – Nov 4 |
| Onions | Jan 16 – Feb 20 | Mar 27 – Jul 6 plant out | Jul 8 – Oct 15 |
| Garlic | – | Oct 6 – Nov 4 sow | Jun 13 – Jul 3 |
| Potatoes | – | Apr 10 – May 23, Jun 12 – Jun 26 sow | Jul 9 – Oct 15 |
| Swiss chard | – | Apr 10 – Jun 8, Jul 16 – Jul 21, Aug 12 – Sep 5 sow | Jun 10 – Nov 11 |
| Basil | Apr 23 – May 21 | Jun 4 – Aug 30 plant out | Jul 2 – Oct 14 |
| Cilantro (coriander) | – | Apr 3 – May 14, Sep 9 – Sep 15 sow | May 25 – Jul 14, Oct 17 – Nov 4 |
| Parsley | Feb 6 – Mar 13 | Apr 3 – May 26 sow | Jun 22 – Nov 10 |
Dates are for a typical year and the middle of the window is the safest. Sow a little at a time across a window rather than all at once. Cold snaps, heat waves, frost pockets and city warmth all shift the real dates; watch the forecast.
Frost dates in Boise
- Average last spring frost
- April 24
- Late frost (1 year in 10)
- May 9
- Average first autumn frost
- October 21
- Early frost (1 year in 10)
- October 5
- Frost-free growing season
- 179 days
“Average” is the date with an even chance of a later (spring) or earlier (autumn) frost: a night at or below 0 °C (32 °F) at screen height. Tender crops go out a week or two after the spring date, which brings the risk down to about one year in ten.
Source: NOAA 1991–2020 normals, Boise Air Terminal (6 km from the city centre).
Climate at a glance
- Hardiness zone
- 7b from station records
- Average coldest winter night
- -15°C5°F
- Warmest month
- July, highs 33°C92°F
- Coldest month
- January, lows -4°C25°F
- Crops with an outdoor window
- 25 of 25
The zone follows the USDA scheme: bands of the average lowest temperature of the year, 10 °F wide, split into a and b halves. Worked out from the coldest night of each year 1991–2020 at the NOAA station. It tells you which perennials survive winter, not when to sow.
Temperature and rain by month
Average highAverage lowRainFreezing point
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 5°C40°F | -4°C25°F | 0°C33°F | 39 mm1.5 in |
| February | 8°C46°F | -2°C29°F | 3°C37°F | 26 mm1.0 in |
| March | 13°C56°F | 1°C34°F | 7°C45°F | 33 mm1.3 in |
| April | 17°C63°F | 3°C38°F | 10°C51°F | 30 mm1.2 in |
| May | 22°C72°F | 8°C46°F | 15°C59°F | 32 mm1.3 in |
| June | 27°C81°F | 11°C52°F | 19°C67°F | 19 mm0.8 in |
| July | 33°C92°F | 15°C59°F | 24°C75°F | 4 mm0.2 in |
| August | 33°C92°F | 15°C59°F | 24°C75°F | 4 mm0.1 in |
| September | 27°C81°F | 10°C50°F | 19°C66°F | 12 mm0.5 in |
| October | 19°C66°F | 4°C40°F | 12°C53°F | 21 mm0.8 in |
| November | 11°C51°F | 0°C31°F | 5°C41°F | 33 mm1.3 in |
| December | 5°C41°F | -3°C26°F | 1°C33°F | 41 mm1.6 in |
Monthly averages 1991–2020 from TerraClimate (about 4 km grid).