August in Zone 5
August in Zone 5: tomatoes peak. Plant fall crops immediately; first frost is 8–10 weeks away.
Quick answer · Updated July 2026
In August, Zone 5 gardeners can plant Spinach, Lettuce, Arugula, Mâche, Garlic, Broccoli, Kale, and Swiss chard. It's also time to harvest Tomatoes, Peppers, and Eggplant. Zone 5's last frost is around Late April – early May and first frost around Early – mid October — the full task list below has exact timing for each crop.
Jump to another month
- Min Winter Temp
- -20 to -10 °F / -29 to -23 °C
- Last Spring Frost
- Late April – early May
- First Fall Frost
- Early – mid October
- Growing Season
- 150–180 days
- Annual Rainfall
- 25–50 in
Gardening in August in Zone 5
August is peak growing season in Zone 5. With a frost-free stretch running roughly Late April – early May to Early – mid October — about 150–180 days — the garden is in full swing, balancing succession sowing with steady harvests.
This month, Zone 5 gardeners are getting Broccoli, Kale, Swiss chard, Cabbage, Spinach, and Lettuce into the ground or under lights while harvesting Tomatoes, Peppers, and Eggplant from earlier plantings. The task cards below give spacing, depth, and timing for each.
About August in the garden
August transitions from peak summer to late summer. Heat continues but days are shortening noticeably. Fall crop planting is urgent in cold zones, and warm-zone gardeners begin planning for fall gardens. Preserving harvests becomes a priority.
Peak tomato and pepper harvest; urgent fall planting in cold zones; canning and preserving; transplanting fall brassicas; planting spring bulbs ordered early.
- Season
- summer
- Temperature trend
- Still hot but temperatures begin easing late in the month in northern zones.
- Daylight
- Noticeably shortening days; losing 2+ minutes of daylight daily.
- Zone 5 last frost
- Late April – early May
- Zone 5 first frost
- Early – mid October
0
Sow indoors
5
Sow outdoors
4
Transplant
3
Harvest
2
Maintenance
🌿 Sow outdoors
Direct sow fall spinach, lettuce, and arugula
Sow ½ inch deep, 2 inches apart; germinates best at 50–65°F; thin to 6 inches.
Surface-sow or ⅛ inch deep; thin to 8 inches for heads, 4 inches for cut-and-come-again.
Surface-sow in wide bands; thins itself as it grows; bolt-prone in heat — shade if needed.
Mâche
Surface sow in autumn for winter harvest; extremely cold-hardy; self-seeds freely.
Plant garlic cloves (late August for early start)
Plant cloves pointed-end up, 2 inches deep and 6 inches apart; mulch with straw.
🪴 Transplant
Transplant fall broccoli, kale, and chard
Sow ¼ inch deep; transplant at 4–6 weeks when 4–5 inches tall; space 18 inches apart.
Sow ¼ inch deep directly or in trays; very cold-hardy; direct sow works well in cool soil.
Sow 1 inch deep, thin to 6 inches; very productive cut-and-come-again crop.
Sow ¼ inch deep; harden off well before transplanting; space 12–18 inches apart.
🧺 Harvest
🛠️ Maintenance
Sow cover crops in cleared beds
Winter rye
Broadcast 2 lbs per 1,000 sq ft and rake in lightly; germinates in cool soil.
Buckwheat
Broadcast and rake in; germinates in 7–10 days in warm soil; terminate before seed set.
When to plant this month's crops in Zone 5
Full planting calendars — start indoors, transplant, and harvest timing — for the crops you're planting in August.
General August tasks
These apply broadly regardless of zone — a useful checklist alongside the zone-specific tasks above.
- ✓Direct sow fall spinach, arugula, and lettuce in cold and temperate zones
- ✓Transplant fall broccoli, kale, and chard starts
- ✓Plant fall-bearing strawberries
- ✓Order spring bulbs for fall planting
- ✓Harvest and preserve: tomatoes, peppers, cucumbers, beans
- ✓Sow cover crops in empty beds to suppress weeds and build soil
- ✓Reduce fertilizing on perennials to encourage hardening-off before winter
- ✓Deadhead spent flowers to extend bloom or let seed heads form for birds
⚠ Watch-outs for August
- ⚠Late August is the last chance to plant fall crops in cold zones (Zones 3–5) — time is short
- ⚠Tomato late blight can spread rapidly in cool, wet August conditions — inspect daily
- ⚠End-of-season exhaustion in squash and cucumber plants — pull when productivity drops
- ⚠Fall armyworms arrive in the South in August — inspect grass and leafy crops
August in Zone 5: common questions
What can I plant in August in Zone 5?＋
In August, Zone 5 gardeners can sow or transplant Spinach, Lettuce, Arugula, Mâche, Garlic, Broccoli, Kale, and Swiss chard. August in Zone 5: tomatoes peak. Plant fall crops immediately; first frost is 8–10 weeks away.
When is the last and first frost in Zone 5?＋
Zone 5 typically has its last spring frost around Late April – early May and its first fall frost around Early – mid October, giving a growing season of roughly 150–180 days. Always check a local frost-date source, since microclimates vary.
What's ready to harvest in August in Zone 5?＋
In August, Zone 5 gardeners are typically harvesting Tomatoes, Peppers, and Eggplant. Pick regularly — frequent harvesting keeps most crops producing longer.